A salt crystal has a mass of 0.15 mg. How many NaCl formula units does it contain?

1) Balanced chemical reaction 1:

2CuFeS₂ + 3O₂ → 2CuS + 2FeO + 2SO₂.  

Balanced chemical reaction 2: 2FeO + SiO₂ → 2FeSiO₃.  

Balanced chemical reaction 3: 2CuS → Cu₂S + S.

Balanced chemical reaction 4: Cu₂S + S + O₂ → 2Cu + 2SO₂.

m(Cu) = 3.0 g; mass of copper in one penny.  

n(Cu) = m(Cu) ÷ M(Cu).

n(Cu) = 3 g ÷ 63.55 g/mol.

n(Cu) = 0.047 mol; amount of copper in one penny.

2) From balanced chemical reactions: n(Cu) : n(CuFeS₂) = 1 : 1.

n(CuFeS₂) = 0.047 mol.

ω(CuFeS₂) = 63.00% ÷ 100%.

ω(CuFeS₂) = 0.630; a percent yield of chemical reaction 1.

m(CuFeS₂) = 0.047 mol · 183.54 g/mol ÷ 0.630.

m(CuFeS₂) = 13.692 g; mass of chalcopyrite for one penny.

m(CuFeS₂) = 13.6927 g · 100.

m(CuFeS₂) = 1369.27 g; mass of chalcopyrite for 100 pennies.

The percent yield of a reaction indicates the percentage of the theoretical maximum product that is actually obtained. Due to a 63% yield in the first reaction stage, more chalcopyrite than the actual weight of 100 pennies needs to be mined. This original amount of chalcopyrite can be found by reverse calculating the theoretical yield that leads to 250g as the actual yield.

To answer this question, we need to first understand the concept of percent yield. This is a measure of how much of a product is obtained in a chemical reaction relative to the theoretical maximum amount that could be produced. It is calculated using the formula:

Percent Yield= (actual yield/theoretical yield) x 100%

In the given question, the percent yield of the reaction involving chalcopyrite is 63.00%. Post that, all other reaction steps had a yield of 100%, implying no loss in those stages. Therefore, to produce 100 pennies, we would need to mine more chalcopyrite than the actual weight of 100 pennies, to account for the loss in the first stage of the reaction.

Assuming a penny weighs about 2.5 g and is composed primarily of copper, 100 pennies would weigh approximately 250 g. To calculate how much chalcopyrite needed to be mined considering the percent yield, we would reverse calculate the theoretical yield that gives us 250g as actual yield at 63%. That would indicate the original amount of chalcopyrite needed to be mined.

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The correct representation for the subshell with n=2 and l=1 is the '2p' subshell, which has three orbitals, each capable of holding two electrons, for a total of six electrons. This follows the notation where 'n' indicates the principal quantum number, and 'l' (the azimuthal quantum number) determines the subshell type.

The correct representation for the subshell with n=2 and l=1 is the 2p subshell. In the notation used for electronic configurations, 'n' represents the principal quantum number, which corresponds to the principal shell, and 'l' represents the azimuthal quantum number, which corresponds to the subshell. Since 'l' is equal to 1, we refer to the subshell with the letter 'p'. As such, the entire designation becomes '2p', with the number '2' denoting the principal shell and 'p' denoting the type of subshell.

It is important to note that each principal shell has 'n' subshells. Therefore, with n=2, there are two subshells available which are 2s and 2p. The 2p subshell is allowed because n ≥ 2, while a 2d subshell would not exist since a 'd' subshell begins with n=3.

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i believe it is chemical change.

hope it helps

Hello!

To find electron configuration for Idoine we need to understand the following steps:

In this case, for Iodine. If we follow these rules we can see that the electron configuration is [Kr] 4d^10 5s^2 5p^5. We use Krytpon in front because that is the last full and stable noble gas before this particular element. Atoms are just trying to be stable so the goal is to achieve that full shell.

The electron configuration for a neutral iodine atom is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵, and for an iodine anion (I⁻), it gains one more electron, resulting in 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶.

The electron configuration of iodine (I), which is a halogen with the atomic number 53, follows the aufbau principle and Hund's rule, filling orbitals in order of increasing energy. For a neutral iodine atom, the electron configuration is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵.

When iodine forms an anion with a 1- charge, such as when it's added to table salt as an essential dietary element to prevent goiter, it gains an extra electron. The electron configuration for the iodine anion (I⁻) is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶.

The Bohr model describes the arrangement of electrons in atoms. In magnesium, electrons orbit the nucleus in shells, influencing its reactivity. Sodium's Bohr model explains its outer electron's reactivity, useful in cloud seeding. Both models contribute to understanding atomic structure and behavior.

1. The Bohr model for magnesium involves electrons orbiting the nucleus in quantized energy levels or shells. Magnesium has 12 electrons, with the first two in the innermost shell and the remaining 10 distributed in the subsequent shells. The electrons occupy specific orbits, and transitions between these orbits result in the absorption or emission of energy. The outermost shell, containing two electrons, is not fully filled, making magnesium a reactive metal. The production of uranium involves magnesium compounds acting as reducing agents in various steps.

2. In the Bohr model for sodium, electrons are arranged in shells around the nucleus. Sodium has 11 electrons, with two in the innermost shell and the remaining nine in the outer shell. The outer shell has a single electron in a subshell that is easily lost, leading to sodium's high reactivity. Cloud seeding with sodium salts involves releasing sodium ions into clouds, promoting the coalescence of water droplets and enhancing rainfall. The Bohr model helps explain the electronic configuration and reactivity of sodium.

I believe it is called, Density.

Answer : The ratio of the mass of a substance to its volume is called density.

Explanation :

Density : It is defined as the mass of a substance contained per unit volume.

The unit of mass is gram (g) and the unit of volume is milliliter (ml). So, the unit of density is g/ml.

Formula used :

[tex]Density=\frac{Mass}{Volume}[/tex]

For example : If mass of object is 550 grams  and volume of water displaced 25 ml. Calculate the density of an object.

By using formula, we get:

[tex]Density=\frac{550g}{25ml}=22g/ml[/tex]

Thus, density of the object will be 22 g/ml

Oxidized is that which goes up in oxidation number. The Fe goes from +2 to +3. Reduced goes down. Mn goes from +7 to +2. The oxidizing agent gets reduced. Mn. The reducing agent gets oxidized.

The mass of Ben’s dog is 20 kg.

Mass = 2 m³ × (10 kg/1 m³) = 20 kg

A suspension of the liquid droplets or the solid particle under pressure is called aerosol. When the temperature is increased then, pressure will increase proportionally.

The aerosols are colloidal substances under pressure that gets released as fine particles of spray in the air. They also follow the law of the ideal gas equation.

According to the law, the factors pressure and volume are directly proportional to the number of the moles, and the temperature of the ideal gas of the system.

When the temperature of the aerosol can is heated and raised from 22 to 110 then the pressure of the can will increase in proportion to the temperature as, [tex]\rm P \alpha T[/tex].

Therefore, option D. pressure increases proportionately to the temperature.

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The following best describes technology is:

C. the application of engineering to create useful products.

Technology is the application of scientific knowledge to solve practical problems. It is the use of tools, machines, and other methods to do things more efficiently and effectively. Technology can be used to create products, services, and systems that improve our lives.

Engineering is the discipline that applies scientific principles to design and build structures, machines, and other products. Engineers use their knowledge of science and mathematics to solve problems and create new products.

When engineers apply their knowledge to create useful products, they are using technology. For example, engineers used their knowledge of physics and chemistry to create the first computers. They also used their knowledge of engineering to design and build the machines that are used to manufacture computers.

So, technology is the application of engineering to create useful products. It is the use of scientific knowledge to solve practical problems and improve our lives.

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The complete question is:

Which of the following best describes technology

A. Something created for only scientists to use

B. the method of thinking that scientists use.

C. the application of engineering to create useful products.

D. A scientific idea

Answer:C

Explanation:

As mentioned in its properties, one of the properties of synthetic fibres is that it will stick to the body if in contact with fire, or high temperatures. Hence, as the answer follows, rayon, being a synthetic fibre, will stick to the body.

19 in = 1.6 ft

You know that

12 in = 1 ft

If you divide both sides by 12 in, you get the conversion factor: 1 = 1 ft/12 in.

If you divide both sides by 1 ft, you get the conversion factor: 12 in/1 ft = 1.

Both are conversion factors because they both equal one and multiplying a measurement by one does not change its value.

You choose the conversion that gives you the correct dimensions for your answer. It must have the correct dimensions on top (in the numerator),

Thus, to convert 19 in to ft, you use the conversion factor with “ft” on the top.

∴ Length = 19 in × (1 ft/12 in) = 1.6 ft

False

Although we use many of their ideas to describe atoms today, such as the existence of a tiny, dense nucleus in an atom (proposed by Rutherford), or the notion that all atoms of an element are identical (proposed by Dalton), some of their ideas have been rejected by the modern theory of the atom.

For example, Thompson came up with the plum pudding model to describe an atom, which resembled a sphere of positive charge with electrons embedded in it. We know now, however, that atoms are mostly empty space with a tiny, dense nucleus.

Another example is Dalton's atomic theory, which stated that atoms are indivisible particles. However, this was disproved by the discovery of subatomic particles.

Answer:

Its false

Explanation:

Hey there!

Given the reaction:

4 AI + 3O2 ------>  2 AI2O3

4 moles Al --------- 3 moles O2

9.30 moles Al  --------- ?? moles  O2

9.30 * 3 / 4  =>  6.975 moles of O2

Molar mass O2 => 32.0 g

Therefore:

6.975 * 32.0 =>  223.3 g of Oxygen

Hope that helps!

Answer:

H = 41.3 mol H; Atoms = 56.8 mol

Explanation:

A molecule of propane contains eight atoms of H for every 3 atoms of C or 8 mol H atoms for every 3 mol C atoms.

∴ [tex]\text{Moles of H atoms} = \text{15.5 mol C atoms} \times \frac{\text{8 mol H atoms }}{\text{3 mol C atoms }} = \text{41.3 mol H atoms}[/tex]

Total atoms = 15.5 mol C atoms + 41.3 mol H atoms = 56.8 mol atoms

Given 15.5 moles of carbon atoms in a sample of propane (C3H8), there are a total of 56.87 moles of atoms (carbon and hydrogen combined). This is calculated by dividing the given carbon moles by the count of carbon atoms in a propane molecule, then multiplying the result with the total count of atoms in one molecule of propane.

The question pertains to the calculation of total moles of atoms in propane (C3H8), given the moles of carbon atoms as 15.5. Propane is a hydrocarbon which contains 3 moles of carbon atoms and 8 moles of hydrogen atoms per molecule. Therefore, for every 1 mole of propane, there are 3 moles of carbon and 8 moles of hydrogen, totaling 11 moles of atoms.

If 15.5 moles of carbon atoms are present, this means that there are 15.5/3 = 5.17 moles of propane. Therefore, the total moles of atoms in your propane sample would be 5.17 moles propane x 11 moles atoms/mole propane = 56.87 moles of atoms. This figure consists of the number of moles of carbon and hydrogen atoms combined in the propane sample.

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Answer:

The given statement is True

Explanation:

Calcium, carbon dioxide, and water combine to form calcite. Calcite is a mineral that is composed of calcium carbonate (CaCO3). The chemical reaction that occurs when calcium, carbon dioxide, and water react together to form calcite is called a precipitation reaction.

Diameter of the wire = 0.080 mm

Weight of wire per km = 44.5g  

Weight of wire used to wind a magnet = 600 g

Therefore, length of the wire used:

600 g x 1 km/ 44.5g = 13.48 km

The length of the wire used was 13.48 km .

The length of  wire that was used is 13.48km

You could  calculate how much wire was used by dividing the wire weight  in g by the wire  weight in per gkm

Length of wire used =Weight of wire in g/

Weight of wire per gkm

Let plug in the formula

Length of wire used=600.g/44.5/gkm

Length of wire used=13.48km

Inconclusion The length of  wire that was used is 13.48km

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The answer is 38.05 years

To solve this question, we should convert the given seconds to the year.

So,

Number of seconds in a year = [tex]3.154 * 10^7[/tex]

Seconds the man lived = [tex]11.2 * 10^9[/tex].2 * 10^9

How many years, he lived = ?

Here a unit method will be applied as

Total years the man lived= [tex]1.2 * 10^9/3.154 * 10^7[/tex]

Total years the man lived = 38.05 years

Poor electrical conductors like glass, plastic, wood, etc. conduct heat mainly through vibrations among the molecules. As molecules vibrate, they bump into their neighbors from time to time, transferring some of their energy (i.e. heat). Those neighbors then bump in to some of their neighbors on the other side and transfer some of the energy to them. The process continues, and the heat is transferred through the material, but it happens quite slowly because the molecules are mostly stuck in place (because they're part of a solid material. If they were liquid or gas, they could move around more freely and transport heat more quickly. That process is called convection, rather than conduction). Anyway, metals and other good electrical conductors have the ability to transfer energy through an additional mechanism. In this case, the vibrating molecules literally shake off some of their weakly-bound electrons (which are plentiful in metals and all other good electrical conductors). These high-energy electrons then fly away and bump into other molecules or electrons, transferring the heat. Unlike entire vibrating molecules, however, individual electrons are so small that they can travel much longer distances at much, much higher speeds before they bump into anything. (It's sort of like shooting a gun in a forest. The bullet may travel several hundred feet or more before it actually strikes a tree. If you tried to drive a bus in that same forest, however, you couldn't go more than a few feet without running into something) Hope this helps :)

Metals are good conductors of both electricity and heat due to the presence of free electrons that facilitate energy transfer, resulting in high thermal conductivity. Nonmetals are generally poor heat conductors and are considered insulators because they lack these free electrons, which causes them to transfer heat much slower.

The ability to conduct heat distinguishes metals from nonmetals. Metals like copper, aluminum, and silver are good conductors of electricity and, correspondingly, are also good thermal conductors. The thermal conductivity of metals can largely be attributed to the presence of free electrons that facilitate the transfer of energy as heat.

Nonmetals, on the other hand, typically have a lower thermal conductivity and are considered insulators. Materials such as wood, plastic, and rubber have a limited ability to conduct heat, causing them to be inefficient at transferring thermal energy compared to metals.

The difference is so notable that touching a metal object and a nonmetal object at the same temperature often results in the metal feeling colder due to its rapid heat conduction away from the hand. This property of metals is because they allow energy to flow more quickly throughout the material, whereas nonmetals like paper and Styrofoam conduct energy so slowly that they appear to maintain warmth for longer periods.

Hello!

Before I can answer your question we need to know the different types of chemical reactions that can occur:

Combustion is an answer that can usually be ruled out unless oxidation is occuring in the chemical equation (hyrdrogen occuring with oxygen to react)

Synthesis reaction, also known as a Combination reaction, is when the reactants combine to form a single product.

Decompostion is when a single reactant is deconstructed to form multiple products, or the opposite of Synthesis.

With these definitions alone, since they are opposite types of reactions, the answer would be Synthesis and Decomposition reactions !

Hope this helps and if you need anymore clarification feel free to ask.

Answer: Synthesis and decomposition

Both equations are balanced.

a) 3H₂SO₄ + 2Al ⟶ Al₂(SO₄)₃ + 3H₂

On the left On the right

      6H                6H

      3S                 3S

    12O               12O

     2Al                2Al

b) 2KCl + Pb(NO₃)₂ ⟶ 2KNO₃ + PbCl₂

On the left   On the right

      2K                 2K

      2Cl               2Cl

      1Pb                1Pb

     2N                 2N

     6O                 6O

Given:

A → Products

         [A] M            Rate(M/s)

1.        0.15            0.014

2.       0.30           0.113

3.       0.60           0.905

To determine:

Order of the reaction

Explanation:

The rate of the given reaction can be expressed as:

Rate = k [A]ⁿ-----(1)

where k = rate constant

[A] = concentration of A

n = reaction order

Based on equation (1) the Rates 1 and 2 can be expressed as:

0.014 = k[0.15]ⁿ ------(3)

0.113 = k[0.30]ⁿ-------(4)

Dividing eq (4) by (3) we get:

0.113/0.014 = [0.30/0.15]ⁿ

8 = 2ⁿ

i.e. 2³ = 2ⁿ

n = 3

Ans: Thus, the order of the reaction is 3

The order of the given reaction is [tex]\boxed{3}[/tex] .

Further Explanation:

Order of reaction:

This indicates dependence of rate on power of concentration of reactants involved in the chemical reaction. On the basis of order of reaction, reaction can be first-order, second-order and so on.

Given reaction is as follows :

[tex]A\rightarrow\text{Products}[/tex]

Consider n to be the order of this reaction. So rate of reaction for the given reaction is expressed as follows:

[tex]\text{Rate}=k\left[A\right]^n[/tex]                                                   ...... (1)

Here,

k is the rate constant for the reaction.

[A] is the concentration of A.

n is the order of reaction.

When concentration of A is 0.15 M, rate of reaction is 0.014 M/s.

Substitute 0.15 M for [A] and 0.014 M/s for rate in equation (1).

[tex]\text{0.014\text{M}}=k\left[0.15\right]^n[/tex]                                              ...... (2)

When concentration of A is 0.30 M, rate of reaction is 0.113 M/s.

Substitute 0.30 M for [A] and 0.113 M/s for rate in equation (1).

[tex]\text{0.113\text{M}}=k\left[0.30\right]^n[/tex]                                              ...... (3)

Dividing equation (3) by equation (2),

[tex]\begin{aligned}\dfrac{\text{0.113\text{M}}}{\text{0.014\text{M}}}=&\dfrac{k\left[0.30\right]^n}{k\left[0.15\right]^n}\\\left(2\right)^3=&\left(2\right)^n\end{aligned}[/tex]

Solving for n,

[tex]n=3[/tex]

Therefore order of reaction becomes 3.

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Answer Details:

Grade: Senior School

Subject: Chemistry

Chapter: Chemical Kinetics

Keywords: order, rate, k, A, products, 3, n, rate constant, order of reaction, 0.15 M, 0.30 M, 0.113 M/s, 0.014 M/s.

1) Answer is: there are 9.04 moles of the hydrogen in 4.52 mol of the water.

n(H₂O) = 4.52 mol; amount of the water molecules.

In one molecule of the water, there are two hydrogen atoms.

n(H₂O) : n(H) = 1 : 2.

n(H) = 2 · n(H₂O).

n(H) = 2 · 4.52 mol.

n(H) = 9.04 mol; amount of the hydrogen atoms.

2) Answer is: there are 25.29 moles of the hydrogen in 8.43 mol of the ammonia (NH₃).

n(NH₃) = 8.43 mol; amount of the ammonia molecules.

In one molecule of the ammonia, there are three hydrogen atoms.

n(NH₃) : n(H) = 1 : 3.

n(H) = 3 · n(NH₃).

n(H) = 3 · 8.43 mol.

n(H) = 25.29 mol; amount of the hydrogen atoms.

3) Answer is: there are 0.408 moles of the hydrogen in 0.102 mol of the hydrazine (N₂H₄).

n(N₂H₄) = 0.102 mol; amount of the hydrazine molecules.

In one molecule of the hydrazine, there are four hydrogen atoms.

n(N₂H₄) : n(H) = 1 : 4.

n(H) = 4 · n(N₂H₄).

n(H) = 4 · 0.102 mol.

n(H) = 0.408 mol; amount of the hydrogen atoms.

4) Answer is: there are 770 moles of the hydrogen in 35.0 moles of the decane (C₁₀H₂₂).

n(C₁₀H₂₂) = 35.0 mol; amount of the decane molecules.

In one molecule of the decane, there are twenty two hydrogen atoms.

n(C₁₀H₂₂) : n(H) = 1 : 22.

n(H) = 22 · n(C₁₀H₂₂).

n(H) = 22 · 35.0 mol.

n(H) = 770 mol; amount of the hydrogen atoms.

For H2O, NH3, N2H4 and C10H22, the respective numbers of moles of Hydrogen are: 9.04, 25.29, 0.408, and 770.

To determine the number of miles of Hydrogen (H) in each sample, we first need to recognize that in each molecule of H2O there are two atoms of hydrogen, in each molecule of NH3 there is three atoms of hydrogen, in each molecule of N2H4 there are four atoms of Hydrogen and in each molecule of C10H22 there are twenty-two atoms of Hydrogen.

Then, to get the number of moles of Hydrogen you multiply the number of moles of the compound by the number of hydrogen molecules in that compound. For example, for H2O, you have 4.52 moles * 2 = 9.04 moles of H.

Therefore, for H2O, NH3, N2H4 and C10H22, we have:

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Most of the mass is made of the protons and neutrons.

Answer:

Protons and neutrons

Explanation:

This is a simple answer, but I assure you it is 100% correct and verified.

Hope this helps.

1. Plasma is "the state..." because plasma is rarely natural on earth (only lightning strikes) and has the highest temp

gas is "particles move freely" they do move freely

liquid is "it expands to fill volume" they do not have definite boundaries so they fill up the container

solid is "it retains its shape" yup dis is pretty obvious ig

2.

I agree with your answers.

it wouldnt be hypothesis or theory because they are basically the same thing and they explain facts. fact would be the best answer

conduct experiments would be the most logical here because you can gain new knowledge from conducting experiments instead of the rest.

Final answer:

To find the volume of an object, use the formula Volume = Mass / Density. This can be applied by dividing the object's mass by its given density, yielding the volume in appropriate units.

Explanation:

How to Find Volume Using Mass and Density:

To find the volume of an object when you have the mass and the density, you can use the formula:

Volume = Mass / Density
This formula is derived from the basic density equation, Density = Mass / Volume, which can be rearranged to find volume. For example, if the mass of an object is given in grams and its density is given in grams per cubic centimeter, dividing mass by density will give you the volume in cubic centimeters.

Example Problem:

Lets say we want to find the volume of an object with a mass of 250 grams and a density of 5 grams per cubic centimeter. Applying the formula:

Volume = Mass / Density = 250g / 5g/cm3 = 50 cm3

In this case, the volume of the object would be 50 cubic centimeters.

Answer:

The Somatic nervous system and The autonomic nervous system

are two parts of the peripheral nervous system.

Explanation:

The peripheral nervous system is a part of the nervous system which is present outside the spinal cord and the brain.

Its function is to link the central nervous system to the organs and limbs.

The peripheral nervous system is of two types

Somatic nervous system: its main function is to regulate the body movements and the control of voluntary muscular activity is called reflex arcs

The autonomic nervous system: its function is to control all the body functions like digestion, urination.heart rate, pupillary response, and respiratory rate.

he is a good scientist because he postulated that chemical reactions resulted in the rearrangement of the reacting atoms

Final answer:

John Dalton was a good scientist known for laying the foundation of modern atomic theory in Chemistry. Unlike his predecessors, he backed his theories with experimental evidence. His work in the field earned him considerable honor and influence.

Explanation:

John Dalton was indeed a good scientist, and his work had a profound impact on the field of Chemistry. Not only did Dalton lay the foundations of the modern atomic theory, but he also provided experimental evidence to support his ideas, which differentiated him from earlier philosophers who merely speculated about the nature of matter.

Dalton observed that matter combined in fixed ratios and that chemical compounds always contain the same proportion of elements by mass, a concept supporting the law of definite proportions. It's also worth noting that Dalton was recognized for his work in science with numerous honors, and his influence was significant enough that over 40,000 people in Manchester paid their respects at his funeral.

Answer:

The possible values are l={0,1}

Explanation:

Hi,the possible values that the Azimuthal number (l) are given by the value of the Principal quantum number (n) of the atomic level you are in:

[tex] l=[0;n-1][/tex]

In this case:

For [tex]n=2 \longrightarrow n-1=2-1=1[/tex]   so l values will be 0 and 1

This different values  the Azimuthal numbar can have, determine the different types of sublevels that atomic level has.

For example: