Consider the electron configuration
Which element has this electron configuration?
astatine
bromine
chlorine
fluorine

Answer:

Explanation:

The halogens have seven electrons in their outermost shell. Each halogen atom lacks a single electron to make their octet a complete one. Elements in the halogen group are univalent and also acceptors of electrons. They are all non-metals and oxidizing agents. The oxidizing power of the halogens decreases from top to down the group. This is why the more powerful halogens displaces a less powerful one from simple salts.

         Cl₂ + 2KBr → 2KCl + Br₂

         Cl₂ + 2KI → 2KCl + I₂

          Br₂ + 2KI → 2KBr + I₂

          I₂ + 2KCl → No reaction

Final answer:

By using displacement reactions, we can deduce the reactivity order of halogens. A more reactive halogen displaces a less reactive one in compounds, and the reactivity order is [tex]F2 > Cl2 > Br2 > I2,[/tex] indicating chlorine is more reactive than both bromine and iodine.

Explanation:

Displacement reactions among halogens indeed allow us to determine their order of reactivity. When a more reactive halogen, like chlorine, reacts with the salt of a less reactive halogen, such as iodide, it displaces the less reactive halogen from its compound. The order of reactivity for halogens is fluorine, chlorine, bromine, and then iodine, with fluorine being the most reactive and iodine being the least. The reaction between chlorine and potassium iodide, which results in the displacement of iodine, can be written as:

[tex]Cl2 (g) + 2KI (aq) -- > 2KCl (aq) + I2 (s)[/tex]

In this reaction, chlorine oxidizes the iodide ions to elemental iodine and is itself reduced. This shows that chlorine is more reactive than iodine. Similar displacement reactions can be set up to compare the reactivity of bromine and iodine or chlorine and bromine, following the principle that a more reactive halogen will displace a less reactive halogen from its compounds.

Answer:

163.44 g

Explanation:

We know that one ton is equal to 2000 lbs and one lb is equal to 454 grams.

Solution:

1.80 × 10∧-4 ton× 2000 lb/ton× 454 g/lb

1.80 × 10∧-4 ton× 2× 10³lb/ton× 454 g/lb

1634.4 g/ 10 = 163.44 g

Final answer:

To convert 1.80 x 10^-4 tons into grams, multiply by 2,000 to get pounds, and then by 453.59237 to convert pounds to grams, resulting in 81.646826 grams.

Explanation:

To convert 1.80 x 10^-4 tons to grams, you'll need to multiply the number of tons by the unit equivalence. In the English or Imperial system, 1 ton is equivalent to 2,000 pounds, and we know that 1 pound is equal to 453.59237 grams. Therefore, the calculation to convert tons to grams is as follows:
1.80 x 10^-4 tons * 2,000 pounds/ton * 453.59237 grams/pound

Performing this calculation:

1.80 x 10^-4 tons * 2,000 * 453.59237 = 81.646826 grams (rounded to six decimal places).

Thus, 1.80 x 10^-4 tons is equivalent to 81.646826 grams.

Answer:

The given graph in the question shows relation between melting point and boiling point of the given substance.

Explanation:

The above given graph shows Direct proportionality between melting point and boiling point that is with the decreasing of melting point, the boiling point is also decreasing. Hence the proportionality is shown between the two temperatures of boiling and melting in the given graph.

Answer:

86 mL

Explanation:

First find the moles of Pb (NO3)2

n=cv

where

c ( concentration)= 0.210 M

v ( volume in L) =0.05

n= 0.210 × 0.05

n= 0.0105

Using the mole ratio, we can find the moles of KCl by multiplying by 2

n (KCl) =0.0105 ×2

=0.021

v (KCl)= n/ c

= 0.021/ 0.244

=0.08606557377

=0.086 L

= 86 mL

Answer:

The volume of 0.244 M KCl solution is required 86.07 mL.

Explanation:

[tex]Concentration=\frac{Moles}{Volume (L)}[/tex]

Moles of lead nitrate in 50.0 mL of 0.210 M solution be n.

Molarity of the lead nitrate solution = 0.210 M

Volume of the solution = 50.0 mL = 0.050 L ( 1 mL = 0.001 L)

[tex]0.210 M=\frac{n}{0.050 L}[/tex]

[tex]n=0.210 M\times 0.050 L=0.0105 mol[/tex]

According to reaction given, 1 mole of lead nitrate reacts with 2 moles of KCl.

Then 0.0105 moles of lead nitrate will react with:

[tex]\frac{2}{1}\times 0.0105 mol=0.021 mol[/tex] of KCl

Moles of KCl = 0.021 mol

Volume of KCl solution = V

Molarity of the KCl solution = 0.244 M

[tex]0.244 M=\frac{0.021 mol}{V}[/tex]

[tex]V=\frac{0.021 mol}{0.244 M}=0.08607 L = 86.07 mL[/tex]

The volume of 0.244 M KCl solution is required 86.07 mL.

Answer:Convection currents drive the movement of Earth's rigid tectonic plates in the planet's fluid molten mantle. In places where convection currents rise up towards the crust's surface, tectonic plates move away from each other in a process known as seafloor spreading (Fig. 7.21).

Explanation:

Convection drives plate movement because of high convection current on the Earth’s core.  It makes molten rocks to move in molten layer.

Explanation:

In the aesthenosphere, high convection currents pass heat on the surface, where less dense magma leaves break down plates in distribution centres and create different plate boundaries.

When the plate moves away from the propagation centres, they also cool down to higher-density rocks, which are part of the oceanic crust consumed in ocean subduction areas. Then, the crust returns to aesthenosphere.

Generally, the heat generated by the radioactive decomposition of elements deeper in the Earth produces magma (molten rock) in aesthenosphere. It (70 to 250 km) is a part of mantle, the central globe, extending over 2,900 km.

Answers and explanation:

To answer these questions you use a periodic table.

A is In because it has 49 protons and In is element number 49.

B is 27 because Co is element number 27.

C is 73 because Ta is element number 73.

D is 49 because the number of electrons in an atoms is always equal to the number of protons.

E is 56 because the atomic number of Ba is 56.

F is 54 because 56 - 54 = 2. The charge is equal to the number of protons minus the number of electrons.

G is 66. The number of neutrons is equal to the atomic mass minus the number of protons. 115 - 49 = 66.

H is 108 because 181 - 73 = 108.

I is 32. The atomic mass of an element is equal to the amount of protons plus the amount of neutrons. So 16 + 16 = 32.

Answer:

7.983761 %

Explanation:

Step 1: What is percent error ?

⇒Percent error is calculated using the following formula:

⇒% error  =  | Experimental value-theoretical value/theoretical value |  x 100%

⇔ this can be written as well as : error = (| Experimental value/ theoretical value | - | Theoretical value / Theoretical value | ) * 100%

⇒ which, after simplifying, will become :

%error = (| Experimental value - theoretical value  - 1 |) x 100%

For this case, this means :

%error = ( |6.8 g/cm³ - 7.39g/cm³  - 1 | ) x100%

%error = | 0.92016238 -1 | x100%

%error = |-0.07983761 | x100%

%error = 0.07983761 x100%

%error = 7.983761 %

The %error is 7.983761 %

Answer:

The correct classification of the statement is all compounds.

Explanation:

Answer:

Explanation:

Persons body temperature

Answer: Change in air temperature is the independent variable

Explanation:

The independent variable can be defined as the factors that is under control of the experimenter.

There can be changes in the air temperature based on that the temperature of the body will change.

So, in this condition the independent variable is air temperature and dependent variable is body temperature.

Answer:

Si ⇔ Neon

Fr ⇔ Radon

Hg ⇔Xenon

V ⇔Argon

Explanation:

Silicon (Si) is, part of the carbon-group, and has atomic number 14. This means it has 14 protons and 14 elecrons ( same amount), as well as 14 protons ( 28-14).

⇒There are 14 electrons spread over 3 shells.

If we look closer to the electron configuration of a silicon atom:

₁₄Si 1s² 2s² 2p⁶ 3s² 3p²  ⇔ this is  [Ne] 3s² 3p²

⇒ Neon (Ne) is noble gas ( group 18)  with atomic number 10.

⇒The following orbital is 3s, which is complete with 2 electrons.

⇒The next orbital is 3p, and Silicon is the second element in that section, so two electrons are used.

Francium (Fr) is part of the alkali / lithium group and has atomic number 87. This means it has 87 protons and 87 electrons ( same amount), and 136 neutrons  (223 - 87).

⇒There are 87 electrons spread over 7 shells.

If we look closer to the electron configuration of a francium atom:                                                    

₈₇Fr 1s²2s²2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 7s¹ ⇔ this is [Rn] 7s¹

⇒ radon (Rn) is noble gas( group 18) with atomic number 86

⇒we will see that the  4 s  orbital fills with electrons before any of those in the  3 d  subshell as the  4 s  orbital is lower in energy than the  3 d s, and it is favorable for electrons to fill low-energy orbitals first (closer to the nucleus)

⇒Francium will fill orbitals all the way up to the  7 s  subshell, where it will have a half-filled orbital:   7 s 1

Mercury (Hg) is part of the zinc group, and has atomic number 80. This means it has 80 protons and 80 electrons ( same amount), and 121 neutrons ( 201 - 80).

⇒There are 80 electrons spread over 6 shells

If we look closer to the electron configuration of a Mercury atom:                                                            

₈₀Hg 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² ⇔  this is[Xe] 4f¹⁴ 5d¹⁰ 6s²

⇒xenon (Xe) is noble gas ( group 18) with atomic number 54.

⇒After the 6s orbital is filled, 4f fills next (can hold 14 electrons) because it lower in energy than 5d.  

⇒Then, the 10 remaining electrons will go in the 5d orbital. The f orbitals will always be one principle quantum number(n) behind the d orbitals.

Vanadium (V) is part of the vanadium group, and has atomic number 23. This means it has 23 protons and 23 electrons (same amount), and 28 neutrons (51 - 23).

⇒There are 23 electrons spread over 4 shells

If we look closer to the electron configuration of a vanadium atom:                                                  

₂₃V 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s² ⇔ this is [Ar] 3d³ 4s²

⇒argon (Ar) is a noble gas (group 18) with atomic number 54.

⇒ When the atom of V releases 5 electrons from 3d and 4s orbital, V ion (V5+) will attain the octet structure, 1s2 2s2 2p6 3s2 3p6 which is same as Argon

Answer:

Neon (Ne) for Silicon (Si)

Radon (Rn) for Francium (Fr)

Xenon (Xe) for Mercury (Hg)

Argon (Ar) for Vanadium (V)

Explanation:

Did it on edge

Answer:

A diamond is a pure substance because it is made of one element.

Explanation:

From the crystalline structure model of the diamond, we can see that we only have just one element represented by the green balls connected in a cross linked fashion to one another. Therefore, one can rightly conclude that this is a pure substance made up of one element.

In a pure substance, all parts are homogeneous and composition is definite.

Answer:

A

Explanation: Decreasing the protons makes the atom negatively charged as there is less protons and more electrons therefore it's an ion now.

Answer:

B) The atom would become a different element.

Explanation:

As we know, the proton is a subatomic particle characterized as the particle that has a positive charge.

An atom can gain, lose or share electrons to achieve electronic stability. However, this does not happen with the proton. If the number of protons in a element decreases, that element begins to have a different atomic number, which indicates that another element has been formed.

Answer:

1.608 g/cm3

Explanation:

Formula:

D=m/v

d= density

m= mass

v= volume

Given data:

Mass= 19.3 g

Volume= 12 cm3

The volume of water displaces by object is 12 cm³ which means that object hold the volume of 12 cm³

Now we will put the values in formula:

D=19.3 g/ 12 cm3= 1.608 g/cm3

so the density of object is 1.608 g/cm3

Answer:

Explanation:

Mechanical and thermal energy are both different forms of energy. They can be converted from one to another. Some systems relies solely on this form of energy conversion  between these types of interactions.

Mechanical energy is a form of energy that is due to the motion of a body.

Thermal energy is due to the temperature changes between bodies.

Both forms of energy are not related but they can be converted from one from to anther.

Answer:

that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

Explanation:

According to the law of conservation of mass, mass can only be conserved in an isolated system.

Recall:

The law of conservation of mass states that mass can neither be created nor destroyed. However, it can be converted from one form to another.

In an open system, the mass may not be conserved because materials and energy are being exchanged between the system and the surrounding.

The mass may also not be conserved in a closed system because energy can be exchanged between the system and the surroundings even though materials cannot.

An isolated system does not exchange materials or energy with its surrounding. Thus, mass is only conserved when a system is in an isolated state.

More on the law of conservation of mass can be found here: https://brainly.com/question/14236219

Answer:

1) volume of the vessel = 22.86 L

2) the pressure in the vessel  = 1.37 atm

Explanation:

to Calculate the volume of the vessel we are going to use this formula :

PV = nRT

when :

P is a pressure which is the force per unit area extended by the gas on the vessel = 1 atm

V is a volume which is the amount of space occupied by air or gas= ??

n is the number of moles = 1 mole

R is the ideal gas constant = 0.08206 L atm mol-1K-1

T is temperature in kelvin =273 K

by substitution:

1 atm * V = 1* 0.08206 * 273

V of air = 22.4 L

to assume V of water we can make this equation:

volume of the vessel = V of water + V of air

by Assuming V of water = X &  volume of the vessel = 50 X

so ,

50 X = X + 22.4 L

X = 22.4 L/49 = 0.457 L

so,volume of the vessel = 0.457 *50 or ( 0.457+22.4) = 22.86 L

2) to calculate the pressure in the vessel at constant volume:

P1/T1 = P2/T2

at constant volume the relation between pressure and temperature is directly proportional

when  the boiling point of water is equal = 100 °C = 100 + 273 = 373 K

1 atm /273 K = P2 / 373K

So P2 = 373/273*1

          = 1.37 atm

Answer:

Metals are good conductors of electricity because the valence electrons in metallic crystals are free to move.

Explanation:

Metallic bonds joins atoms of metals and alloys together. The formation of this bond type is favoured by large atomic radius, low ionization energy and a large number of electrons in the valence shell.

The metallic bond is responsible for the bulk of the physical properties of metals we know such as malleablility, ductility, electrical and thermal conductivity e.t.c.

Answer:

9.474 x 10^2

Explanation:

ok. first you have to get the value in the required unit so 9474mm/(10mm/cm) = 947.4 so scientific notation states that the number must be raised to any power of an integer and the value of the number being raised must be less than than 10 and more than or equal to 1

so it must have one digit in front so.. 947.4 becomes 9.474 and because you move 2 places to the left, ur power is positive 2

and proof 10^2 is 100 so multiply 9.474 by 100 and u will get 947.4 cm which is also 9474 mm

Answer:

The purpose of a control sample is to compare its results to those with the experimental sample. Control sample is a type of renown forensic samples usually used to ensure analyses are properly performed to assure reliable results.

HOPE THIS HELPED!!!!!!!!!!!XDDDDDDDDD

The control sample in the experimental system has been used as the reference for the test.

The experimentation setup has been consisted of the test sample along with the control sample as designated conditions.

The control sample has been set in an experimental setup as the reference. The test sample has been consisted of the substance to be tested, and the control sample lack the substance.

The samples are treated at equivalent conditions and the results has been compared from test to control abut the difference bought by the substance.

Thus, the control sample in the experimental system has been used as the reference for the test.

Learn more about control sample, here:

https://brainly.com/question/10851484

Answer:

the energy of a microwave photon E = 16.565 x 10^-25 Joule

Explanation:

To get the energy of the photon we are going to use this formula :                                       E = hf

when E is the energy of the photon which we need to calculate

h is Planck's constant = 6.626 x 10^-34 J.S

f is the photon of frequency = 2.5 X 10^9 Hz

so by substitution:

the energy of a microwave photon E = 6.626 x 10^-34 J.S * 2.5 X 10^9 S-1

  = 16.565 x 10^-25 Joule

Final answer:

The energy of a microwave photon with a frequency of  2.5 x 10⁹  Hz is 1.6565 x 10⁻²⁴ Joules, calculated using Planck's equation.

Explanation:

The question asks: What is the energy of a microwave photon of frequency 2.5 x 10⁹ Hz? To find this energy, we use Planck's equation, which states that the energy (E) of a photon is equal to the product of Planck's constant (h) and the frequency (f) of the photon. Mathematically, this is expressed as E = hf. Planck's constant is 6.626 x 10⁻³⁴ J-s. Substituting the given frequency and Planck's constant into the equation gives E = (6.626 x 10-⁻³⁴J-s)(2.5 x 10⁹ Hz), which calculates to 1.6565 x 10⁻²⁴ Joules (J).

Answer:

Scientific inquiry

Explanation:

A scientific inquiry is a systematic way of finding out about certain phenomena in our environment through the use of careful observations and experimentation. It follows a series of steps and procedures which helps a scientist to critically think and observe certain events in his environment. Through the observations, scientific conclusions are then drawn.

Answer:J.J. Thomson, he was using a high-vacuum cathode-ray tube

Explanation:(I Googled it)

J.J. Thomson discovered the electron in 1897 using a cathode ray tube.

The discovery of the electron is attributed to the English physicist J.J. Thomson in 1897 through his groundbreaking work with the cathode ray tube. A cathode ray tube operates by passing an electric current through gases at low pressure, forming a glowing beam or cathode ray from the negatively charged cathode to the positively charged anode. Thomson's experiments demonstrated that these rays consisted of negatively charged particles, later named electrons, indicating that atoms were not indivisible as previously thought but composed of smaller subatomic particles. This realization marked a pivotal moment in the understanding of atomic structure, disproving the notion that the atom was the smallest unit of matter.

Answer:

Which statements describe lattice energy?

B,C,D

Explanation:

just did it

Density is mass divided by volume

Happy to help! Please mark me as the brainliest!

Answer and Explanation:

[tex]\huge\boxed{Density=\frac{mass}{volume}}[/tex]

That's the formula ↑

For a 20-gram mass that takes up a volume of 5 cubic centimeters:

[tex]density[/tex] [tex]is=\frac{20}{5} gm/cm^{3}[/tex]

[tex]=4gm/cm^3[/tex]

Answer:

Gallons of water in the dorm room =7391 gallons

Explanation:

Given:

Amount of rainfall = 52 inches

Area of the room = 228 ft^2

To determine:

The gallons of water in the room

Calculation:

Convert area of room from ft^2 to inches^2

1 foot = 12 inches

Therefore, [tex]1 ft^{2} = (12\  in)^{2} = 144\ in^{2}[/tex]

Area of room is:

[tex]\frac{228ft^{2}*144in^{2}}{1ft^{2} } =32832in^{2}[/tex]

Volume of water in the room is:

[tex]=Area\ of\ room * Amount\ of\ rainfall\\\\= 32832 in^{2} * 52\ in = 1707264\ in^{3}[/tex]

Convert from in^3 to gallons:

1 gallon = 231 in^3

Therefore:

[tex]\frac{1707264in^{3} * 1 gallon}{231in^{3}} =7391 gallons[/tex]

The problem gives us the percentages for carbon and hydrogen in the unknown acid:

54.5 % carbon

9.10 % hydrogen

The difference until 100 % is oxygen:

36.4 % oxygen

Now we may calculate the empirical formula of the unknown acid:

First we divide each percentage by the atomic mass of each component:

carbon = 54.5 / 12 = 4.54

hydrogen = 9.1 / 1 = 9.1

oxygen = 36.4 / 16 = 2.28

Now we divide the answers to the smallest number, which is 2.28:

carbon = 4.54 / 2.28 = 2

hydrogen = 9.1 / 2.28 = 4

oxygen = 2.28 / 2.28 = 1

Now the empirical formula for the acid will be:

C₂H₄O₁

And molecular formula:

(C₂H₄O₁)ₓ , but here we do not have enough information to determine unknown "x".

Answer:

any sound really do you have a multiple choice answer

Explanation:

Answer:

we need some more answer so we can answer them

Answer:

The frequency of wave is 0.125 Hz.

Explanation:

Frequency:

"It is an event repeat itself in a given period of time"

The unit of frequency is the Hz . If time is measured in seconds then frequency will be in Hz. Hz is equal to the per second.

Formula:

f = 1/ T

f = 1/ 8 sec

f = 0.125 Hz

Answer:

Charles law

Explanation:

Relationship between volume and absolute temperature is given by Charles's law.

According to Charles's law, at constant pressure, volume of a gas of a fixed quantity is directly proportional to the absolute temperature.

Mathematically Charles's law is expressed as:

[tex]V \propto T[/tex]

Charles's law is applicable only for ideal gases.

Bolyles's law gives relationship between pressure and volume at fixed temperature.

Gay-Lussac’s law gives the relationship between pressure of a gas and its absolute temperature.

Dalton's law gives the relationship between pressure of the mixture of non reacting gases and partial pressure of individual gas.

Therefore, among, Charles's law is the correct opion.