Answer:
The answer is: [tex]7.7\times10^{10}[/tex]
Explanation:
Scientific notation is of the kind: [tex]a.bc\times10^{x}[/tex]
The given calculation:
[tex]7.0\times10^{3}\times1.1\times10^{7}=(7\times1.1)\times10^{(3+7)}[/tex]
[tex]=7.7\times10^{10}[/tex]
Therefore, the answer in scientific notation is: [tex]7.7\times10^{10}[/tex]
Why is liquid displacement the best way to find volume of a sample? Why not just measure with a ruler?
Explanation:
Using a ruler is not ideal for measuring the volume of irregular objects like a random stone. This is because they do not have definite length, width and height dimensions like regular objects eg a block of wood. Measuring the volume of the displaced water (eg using a calibrated cylinder) will give you the volume of the object. Remember an object displaces its own volume of a liquid when fully immersed in the liquid - Archimedes' principle.
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based on bond energies, what will be the heat of reaction for the formation of 2 moles of hydrogen fluoride from one mole each of hydrogen gas and fluorine gas?
Answer:
ΔH₍reaction₎ = ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎ + 2.ΔH₍hydrogen fluoride bond-formation₎ .
Explanation:
Reaction:
H₂ + F₂ --> 2.HF ΔH₍reaction₎
In this reaction, bonds are broken in the hydrogen gas and fluorine gas molecules which then lead to the new bond formation, that is, bond between hydrogen and fluorine atoms which explains the formation of hydrogen fluoride.
ΔH₍reaction₎ = ΔH₍bond-breakage₎ + ΔH₍bond-formation₎
ΔH₍bond-breakage₎ is just ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎.
ΔH₍bond-formation₎ is 2.ΔH₍hydrogen fluoride bond-formation₎ .Since the ΔH₍bond-formation₎ is in the units kJ/mol, a factor of 2 comes in the picture
Therefore,
ΔH₍reaction₎ = ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎ + 2.ΔH₍hydrogen fluoride bond-formation₎ .
Note: Care should be taken while assigning opposite signs to ΔH₍bond-breakage₎ and ΔH₍bond-formation₎.
A chemist obtains a 0.300 M solution of HCI and adds 10.0 mL of the HCI to CaCO3 how many moles of HCI did she add?
Answer:
Number of moles = 0.003 mol
Explanation:
Given data:
Molarity of HCl = 0.300 M
Volume = 10.0 mL (0.01 L)
Number of moles of HCl added = ?
Solution:
Formula:
Molarity = number of moles / volume in litter
Number of moles = Molarity × volume in litter
Number of moles = 0.300 mol/L × 0.01 L
Number of moles = 0.003 mol
A balloon is filled with 0.250 mole of air at 35°C. If the volume of the balloon is 6.23 liters, what is the absolute pressure of the air in the balloon? The absolute pressure of the air in the balloon is kilopascals.
Answer:
102.807 kPa
Explanation:
There are some assumptions to be made in the answer. The air inside the balloon acts as an ideal gas at a given temperature conditions.
Using the combined ideal gas equation.
[tex]PV = nRT\\[/tex]
P= absolute pressure of air inside the balloon.
V= volume of air inside the balloon (6.23 L= 6.23 * 10⁻³ m³)
n= moles of gas(air). (0.250 mol)
R= Universal gas constant ( 8.314 J / mol·K)
T= Temperature in Kelvin
T= 35 + 273.15 = 308.15 K
So, [tex]P = \frac{nRT}{V}[/tex]
[tex]P = \frac{0.250 * 8.314 * 308.15}{6.23 * 10^{-3} }[/tex]
P= 102.807 * 10³ Pa
P= 102.807 kPa
Answer: 103 for Edmentum users !
39. Chromium and chlorine form an ionic compound whose formula is CrCl3. The name of this
compound is
a. chromium (III) chloride
c. monochromium trichloride
b. chromium chlorine
d. chromium(III)trichloride
Answer:
a. chromium (III) chloride
Explanation:
Chromium chloride is also binary ionic compound composed of only two element chromium and chlorine.
When naming these compounds the name of metal or cation is written first and anion is written after the cation. The anions are non meals.
The anion name is end with suffix " ide".
such as chromium chloride.
The (III) shows the oxidation number of metal. In given compound the oxidation state of chromium is +3 while chlorine chow the oxidation state of -1 that's why three chlorine atoms are attached with one chromium atom.
Nitric acid (63 g) and sodium hydroxide (60 g) are mixed. how many grams of water will form.?
In the neutralization reaction between nitric acid and sodium hydroxide, 63g of Nitric acid and 60g of Sodium hydroxide would result in 18g of water. The reaction will be limited by the nitric acid acting as the limiting reagent.
Explanation:The question pertains to a neutralization reaction between nitric acid (HNO3) and sodium hydroxide (NaOH). This reaction produces sodium nitrate (NaNO3) and water (H2O) as per the equation: HNO3 + NaOH → NaNO3 + H2O. To find out the amount of water formed, we need to look at stochiometry of the reaction. From the balanced chemical equation, you can see that 1 mole of nitric acid reacts with 1 mole of sodium hydroxide to produce 1 mole of water.
First, we need to convert the weights of the reactants into moles. The molecular weight of HNO3 is approximately 63 g/mol, so 63 g of nitric acid represents 1 mole. The molecular weight of NaOH is approximately 40 g/mol, so 60 g represents 1.5 moles. Therefore, the limiting reagent in this reaction is nitric acid.
As per the stoichiometry of the reaction, 1 mole of nitric acid will produce 1 mole of water. Thus, 1 mole of nitric acid will give 18 g of water (molecular weight of water is approximately 18 g). So, when 63 g (1 mole) of nitric acid is fully reacted, it will produce 18 g of water.
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What is the source of energy for the Sun?
1 Choice 1
hydrogen fusion
2 Choice 2
internal combustion
3 Choice 3
nuclear fission of metals
4 Choice 4
burning of solar gases
Answer:
Nuclear fusion
Explanation:
Nuclear fusion is the source of Sun's energy.. At the core where temperature and pressure are very high hydrogen atoms fuse into helium atom and release energy in the form of Gama rays.
muutuun
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Describing Enzymes
QUICK CHECK
Which of the following characteristics are true of enzymes? Check all that apply.
The structure of an enzyme can change if conditions change.
A single enzyme can normally catalyze a wide variety of reactions under many conditions.
Enzymes are found only in nonliving systems.
Enzymes allow living things to regulate body conditions through feedback mechanisms.
Enzymes bind to specific substrates in specific ways.
Enzymes increase the rate of reaction.
When shown in energy-reaction diagrams, enzymes represent the higher activation energy.
Enzymes are proteins that can change structure under different conditions, assist in body regulation through feedback mechanisms, bind to specific substrates in specific ways, and increase the rate of reactions. However, they are specific to one reaction, found in living organisms, and represent lower activation energy on diagrams.
Explanation:The following characteristics are true of enzymes:
The structure of an enzyme can change if conditions change. This is due to the fact that enzymes are proteins, and their structure can be affected by external conditions like temperature and pH. Enzymes allow living things to regulate body conditions through feedback mechanisms. They enable the body to respond to changes in the environment by speeding up or slowing down chemical reactions. Enzymes bind to specific substrates in specific ways. This is known as 'enzyme-substrate specificity', and it refers to the fact that each enzyme can only catalyze one particular type of reaction due to the specific shape of its active site. Enzymes increase the rate of reaction. They do this by lowering the activation energy required for a reaction to occur, effectively making the reaction proceed more quickly.
However, some points are incorrect. An enzyme cannot catalyze a wide variety of reactions - it is specific to one type of reaction. Also, enzymes are not found only in nonliving systems; they are a crucial part of all living organisms. Finally, in energy-reaction diagrams, enzymes represent the lower, not higher, activation energy.
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Elias observed a sample in the classroom. The sample was a liquid at room temperature. He performed a conductivity test and found that it did not conduct electricity. Which classification would best fit the sample?
A) ionic
B) metal
C) nonmetal
D) salt
Answer:
C. nonmetal.
Explanation:
It is not ionic because it did not conduct electricity.
There is only one liquid metal at room temperature and that is mercury, which will conduct electricity.
A salt is usually solid at room temperature and if it is in solution will conduct electricity.
Which of the following is a common industrial use for a mineral? (2 points)
A common industrial use for a mineral is in water purification and as an ingredient in antacids. Minerals like fluorite (calcium fluoride) are extensively used in various industries.
Explanation:A common industrial use for a mineral is in water purification and as an ingredient in antacids. Minerals like fluorite (calcium fluoride) can be used extensively in various industries. For example, it can be prepared by the reaction of aqueous solutions of calcium chloride and sodium fluoride to yield solid calcium fluoride, which has several industrial applications.
Where would an element be placed on the periodic table if it had a mass number of 304 amu, very low ionization energy, bonds easily with other elements, melting point of 50.1 degrees Celsius, has the smallest electronegativity, predicatively the largest atomic radius, great metallic character, and silver in color
Answer:
As the atomic number is half of the atomic mass then it probably have 304/2 = 152 atomic number that will be placed before atom having atomic number 153 and after atom that have 151 atomic number.According to all its properties it will be somewhere in the left or middle of the periodic table and will be at the bottom. At the bottom in the super actinide metals series.Explanation:
Data Given:
Predict place of element in the periodic Table having following properties
mass number = 304 amu
Ionization energy = very low
bonds = easily bond with other elements
melting point = 50.1° C
electronegativity = smallest
Atomic radius = largest
metallic character = great
color = silver
Periodic Table is the table where elements were placed based on their atomic number.
In 1913 Mosley construct the periodic table according to their atomic number.
Modern Periodic Law :
the physical and chemical Properties of the elements are the periodic functions of their atomic number.
Atomic Number:
Atomic number is the number of electron or proton, denoted by Z
Z = e or P
Atomic Mass:
Atomic mass is the number of proton plus neutron in the nucleus. it is denoted by A.
A = P + N
Atomic number is almost half of the atomic mass for majority of the element.
Periodicity of periodic Table:
properties of the element repeat itself at certain interval.
Periodicity of Properties is as follow
1. Ionization energy:
The Ionization energy increase from left to right and decreases down the group.
2. Electronegativity:
E.N increase from left to right and decreases down the group.
3. metallic character:
Metallic character increase down the group and decrease from left to right. metals have metallic color, bristle and shiny surface.
4. non-metallic character
Non-metallic character decreases down the group and increases from left to right.
5. Melting point and boiling Point:
Melting point and boiling Point increases when the metallic character increase and decreases when the metallic character decreases.
6. Atomic radius :
Atomic Radius decrease from left to right and increases from top to bottom as shells are added.
Now keeping in mind all above points, to predict the place of the atom whose properties are given.
As the atomic number is half of the atomic mass then it probably have 304/2 = 152 atomic number that will be placed before atom having atomic number 153 and after atom that have 151 atomic number.According to all its properties it will be somewhere in the left or middle of the periodic table and will be at the bottom. At the bottom in the super actinide metals series.what is the number of electrons shared between the atoms in a molecule of nitrogen, N2
Answer:
3 electrons is contributed from each Nitrogen atom.
Total 6 electrons are shared in N₂.
Explanation:
Nitrogen is belong to group VAit have 5 electron in its outer most Shell.it need 3 electrons complete its octet to become stable.Nitrogen have total 7 electrons.its atomic number is 7The electronic configuration of Nitrogen is as:
1s², 2s², 2p³
it exist in diatomic form standard temperature and pressure.
Nitrogen form covalent bond and share 3 electron from each side.
total 6 electron are shared between 2 nitrogen atom.
For Covalent bonding it can share its 3 electrons.
The diagrammatic representation is in attachment.
Answer:
3!!!!
Explanation:
i have the same assignment for chem, lol
Which of the following electromagnetic waves can create ions?
A. Ultraviolet waves
B. Radio waves
C. Gamma rays
D. Infrared waves
Answer:
C. Gamma rays
Explanation:
Answer:
C. Gamma rays
Explanation:
ap3x
14. What is the actual temperature 3000 km below the surface of the Earth?
Answer:
temperature 3000 km below the surface of earth is varied, it's harder to know the actual temperature, it can be found around 3,000 - 3,500 degrees Celsius
The actual temperature 3000 km below the surface of the Earth is around 3,000-3,500 degrees in the lower mantle.
What is the earth's mantle?The mantle of the earth is the mostly-solid bulk of Earth’s interior. The mantle of the earth is that layer that lies between the thin outer layer, the crust, and Earth’s dense, super-heated core.
The mantle of the earth is about 3000 Km thick and creates a whopping 84% of Earth’s total volume. The early mantle is the molten material that surrounded the core.
The rocks that make up the mantle are mostly silicates which are compounds that share a silicon and oxygen structure. The other major kind of rock is magnesium oxide and other mantle elements are calcium, iron, aluminum, sodium, and potassium.
The temperature of the mantle varies from 1000° Celsius near its boundary with the crust to 3500° Celsius near its boundary with the core.
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To two decimal places, what is the relative
atomic mass and the molar mass of the element potassium,K?
Answer:
The atomic mass of Potassium is 39.09 u+-0.0001u and molar mass is 39.09 g,s/mole
Explanation:
Potassium is a metal belongs to group 1 and period 4 whose atomic number is 19 and electron configuration is 2,8,8,1.
The molar mass of Potassium or K is 39.09 g,s/mole and the atomic mass is 39.09 u+-0.0001u. Potassium was first discovered by Humphrey Davey and was first found in the ashes of plants. It also occurs in the mineral sylvite or KCL and is mined as such.
Answer:
Atomic Mass: 39.0983 u.
Molar mass: 39.0983 g/mol
a 160 milligram sample of a radioactive isotope decays to 10 kilograms in 12 years. what is the half life of this element
The half-life of a radioactive isotope is the time it takes for half of the original sample to decay. This can be calculated by measuring how much of the sample remains after a certain period of time. Multiple measurements confirming the same decay period correlate to the half-life of the isotope.
Explanation:Your question relates to the concept of radioactive decay and the calculation of half-life. The specifics in your question seem a bit off; a heavier mass cannot result from decay, as decay processes result in a decrease of mass. However, let's focus on the main part of your question - how to determine the half-life of a radioactive isotope.
The half-life of a radioactive isotope is the amount of time it takes for half of the sample to decay. Given a particular amount of a radioactive substance (expressed in grams, milligrams, or other units), you can determine the number of half-lives by noting how much of the substance remains after a certain period of time.
For example, if you start with 10 grams of a radioactive isotope and after some time you measure and find you only have 5 grams remaining, that period of time would be one half-life for the isotope. If you then waited the same amount of time and found that you had 2.5 grams left, this would confirm the half-life, as again, half the previous amount had decayed. The actual numerical value of the half-life is dependent on the specific isotope and its decay characteristics.
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What types of atoms are shown in a skeletal model of an organic molecule?
A. Atoms of every element except carbon
B. Atoms of every element except hydrogen
C. Atoms of every element
D. Atoms of every element except carbon and hydrogen
Answer:
Atoms of every element are shown in a skeletal model of an organic molecule.
Explanation:
Skeletal model of an organic molecule consists of various skeletal atoms that are used in making up of the molecule. Various conventions of hydrogen and carbon atoms are employed in it. The molecules bonding and certain representation of molecular geometry are shown in the structural formula.
Use of skeletal formula is ubiquitous in organic chemistry. Thus, in organic chemistry atoms of every element are shown in the skeletal model of an organic molecule
Acids have a high pH.
a. True
b. False
Answer:
B. False
Explanation:
In chemistry, pH is a scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH. ... The pH value can be less than 0 for very strong acids, or greater than 14 for very strong bases.
Final answer:
Acids have a high PH - b. False
Explanation:
The statement that acids have a high pH is FALSE. In chemistry, the pH scale is used to measure how acidic or basic which also refers to how alkaline a substance is. The pH scale ranges from 0 to 14, with 7 being neutral, numbers below 7 indicating acidity, and numbers above 7 indicating alkalinity.
Generally, acids have a higher concentration of hydronium ions, resulting in a lower pH, typically below 7. Common examples of acids include vinegar and stomach acid, both known for their low pH levels and acidic properties.
I NEED HELP PLEASE!!
Calculate the amount of heat absorbed when a 15.5-g ice cube melts. The delta Hfus= 6.02 kj/mol.
Answer:
The amount of heat absorbed is 5.183889 kJ .
Explanation:
In conversion of water to ice it rejects some heat while in conversion of ice to water it absorbs heat which is called latent heat which is given as 6.02 kJ/mol.
The amount of ice given is 15.5 g.
Converting it to moles as the latent heat is given in per moles:
[tex]\frac{given\\weight \\ (in\\grams)}{molecular\\weight\\(in\\grams)}[/tex]
Molecular mass of Hydrogen (H) and Oxygen (O) is 1 u and 16 u respectively.
Molecular mass of water is 18 g ( [tex]H_{2} O[/tex] ⇒ 2*1+16=18 ).
mole = 15.5/18 ≈ 0.8611 moles
Therefore the amount of heat absorbed by 15.5 g of ice ( 0.8611 moles) = Latent heat * moles
Heat absorbed = 6.02*0.8611
= 6.02*(15.5/18)
≈ 5.183889 kJ
The Mid-Atlantic Ridge is a divergent tectonic plate boundary. Two plates are moving _______ each other along this boundary. The result of this motion is that North America is moving _______ Europe.
Answer:
away from; away from
Explanation:
A divergent boundary occurs when two tectonic plates move away from each other. Here two plates are moving away from each other along this boundary. The result of this motion is that North America is moving away from Europe.
What is mid-Atlantic Ridge?The Mid-Atlantic Ridge is defined as the mid-ocean ridge which is located at the bottom of the Atlantic ocean which stretches approximately 16,000 kilometers from north to south. Mid ocean ridges are large central rift valleys which is surrounded by the mountain ranges created by tectonic forces along divergent plate boundary lines.
The divergent plate boundaries exist between the plates which are spreading apart from each other. This occurs due to the convection currents in the mantle rising and impacting beneath the lithosphere before spreading out and dragging plates along with them.
The mid Atlantic range ridge separates the Eurasian, north American and african plates.
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The normal boiling point of cyclohexane is 81.0. What is the vapor pressure of cyclohexane at 81.1
Answer:
1 atm
Explanation:
The normal boiling point of a liquid is temperature at which the vapour pressure of the liquid equals 1 atm.
If the normal boiling point of cyclohexane is 81.0 °C, the vapour pressure of the liquid is 1 atm.
The graph below shows that the vapour pressure of cyclohexane reaches 1 atm at about 81 °C.
name the compound CH3CH2CH2C(CH3)2CH2CH3
Answer:
3,3-dimethylhexane
why did you set the limit to 20 characters?
A sample of 76 g of NaCl is dissolved to make 1 L of solution. What is the molarity of the solution? Show your work.
Answer:
1.3005 M
Explanation:
Given that,
Mass of NaCl = [tex]76 \ g[/tex]
Molar mass of NaCl= [tex]22.99+35.45=58.44\ g/mol[/tex]
The formula for calculation of moles,
Moles,
[tex]n=\frac{given \ mass}{molar\ mass}\\n=\frac{76}{58.44} \ g/mol\\n=1.3005\ g/mol[/tex]
Given that volume [tex]=1\ ltr[/tex]
Molarity,
[tex]=\frac{moles\ of\ solute}{litre\ of\ solution} \\=\frac{1.3005}{1}\\ =1.3005\ M[/tex]
Therefore the molarity is 1.3005 M.
U test a substance using red litmus paper turns blue based on these results is the substance acidic or base
Answer:
basic in nature
Explanation:
Litmus Test -
It is the very basic test , used to determine if the solution is acidic in nature or is basic in nature .
There are two type of litmus paper available , i.e. , blue and red .
If the solution is acidic in nature ,putting a blue litmus paper turns red ,
and putting a red litmus paper would not show any change .
And , hence it can be concluded that the solution is acidic in nature .
Similarly ,
If the solution is basic in nature ,putting a red litmus paper turn blue ,
and putting a blue litmus paper would not show any change .
And , hence it can be concluded that the solution is basic in nature .
What is wrong with the following structure H-H-O
Answer:
O atom requires 2 electrons to achieve octet structure and in this structure, it is only bonded to one H atom hence only obtaining an additional valence electron. Without a octet structure, the molecule is unstable hence this structure is incorrect. The correct structure should be H-O-H.
Explanation:
Which chemical equation represents a redox reaction?
Hello. This question is incomplete. The full question is:
"Which chemical equation represents a redox reaction? A. Mg(ClO3)2 + 2HCl → MgCl2 + 2HClO3 B. CO + H2O → H2 + CO2 C. 2NH4NO3 + CuCl2 → 2NH4Cl + Cu(NO3)2 D. Na2SO3 + FeBr2 → 2NaBr + FeSO3 "
Answer:
B. CO + H2O → H2 + CO2
Explanation:
The reactions that involve loss and gain of electrons are called oxide-reduction reactions. In the oxidation reaction, electrons are lost, while the reduction reaction consists of gaining electrons.
Oxidation can occur in three circumstances: when oxygen is added to the substance, when a substance loses hydrogen or when the substance loses electrons. Example: fruit salads tend to darken when they come into contact with air, this is because oxygen acts to promote fruit oxidation. A tip to avoid this is to add lemon or orange juice, as the vitamin C present in citrus fruits prevents the oxidizing action of oxygen on the salad.
Reduction, in turn, is the reverse and also occurs in three ways: when a substance loses oxygen, when it gains hydrogen or when it gains electrons. Example: when the copper oxide (black) is placed in an appropriate apparatus (chamber) for its reduction to occur, the hydrogen gas comes in contact with the super heated copper oxide and, as a result, it loses oxygen and gradually goes away. turning pink as it is being reduced to copper.
An example of a redox reaction is CO + H2O → H2 + CO2
A redox reaction is a reaction that involves the transfer of electrons. An example is the reaction between hydrogen and fluorine, where hydrogen is oxidized and fluorine is reduced.
Explanation:A redox reaction, or reduction-oxidation reaction, involves a transfer of electrons between two species. An example of a redox reaction is the reaction between hydrogen and fluorine:
H2 + F2 → 2HF
In this reaction, hydrogen is oxidized (loses electrons) and fluorine is reduced (gains electrons). Hence this is a redox reaction. You can often identify redox reactions by looking for changes in oxidation states of elements in a reaction.
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what are the characteristics of a proton
Answer:
A Balanced Atom
Most nuclei also contain neutrons. Perhaps the most essential characteristic of a proton is its positive electrical charge. This charge is equal in magnitude to the negative electrical charge of the electron, which means that the charge of one proton balances out the charge of one electron.
Explanation:
A 45-kg boy pulls a wagon with a force of 38 N for a distance of 550 m. If the boy
takes 240 s, what is the power expended by the boy?
Answer:
87.08 W
Explanation:
Power expended by the boy is power needed/ power experienced to/by the wagon throughout this process of pulling.
When the force F is constant and the angle between the force and the displacement s is θ, then the work done is given by W = Fs cos θ.
Assuming that the force and displacement of the wagon are in the same direction cos(θ)= cos(0)= 1
So, W= 38 * 550 (SI units)
W=20,900 J
[tex]Power = \frac{Work done}{Time taken}[/tex]
Power = [tex]\frac{20,900}{240}[/tex]
87.08 W
Answer:
The whole answer is 87.08 but rounding to 2 number its 87
Explanation:
A student uses a magnet to move a 0.025 kg metal ball. The magnet exerts a
force of 5 N, which causes the ball to begin moving. What is the acceleration of
the ball when it begins to move?
Answer:
The acceleration of the ball is 200 m/s².
Explanation:
Force:
Force is the push or pull on an object with mass that causes it to change velocity or to accelerate.
Force represents as a vector, which means it has both magnitude and direction.
Given:
Mass of metal ball = 0.025 kg
Force = 5 N
To Find:
Acceleration, = ?
Solution:
Formula:
[tex]Force = Mass\times Acceleration\\F= ma\\5 = 0.025\times Acceleration\\Acceleration = \frac{5}{0.025} \\Acceleration = 200\ m/s^{2}[/tex]
The acceleration of the ball is 200 m/s².
the subshells of n = 2?
Answer:
There are two subshells for n=2.
Explanation:
Principal quantum number (n)
It tell about the energy levels. It is designated by n.
For example,
If n =2
It means there are two energy level present.
Azimuthal quantum number (l)
The azimuthal quantum number describe the shape of orbitals. Its value for s, p, d, f... are 0, 1, 2, 3.
(n-1)
2-1 = 1
thus possible values of l = 0,1
it means principle quantum is 2 and subshells are s and p..