Gold and helium are examples of a(n)

Answers

Answer 1

Answer:

Gold and helium are the example of element.

What is element?

A material is considered an element if it could not be divided into smaller parts by whatever non-nuclear chemical reaction.

What is gold?

Gold is a kind of element which has atomic number 79 and can be represented by Au.

A soft, golden metal, gold is. Gold was incredibly malleable as well as ductile, along with all other metals. Gold also has a good ability to conduct heat as well as electricity.

To know more about element and gold.

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Answer 2

Answer: gold and helium are examples of elements

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The liquid part of a homogeneous mixture is the _____.a. solvent
b. solution
c. solute
d. colloid

Answers

The liquid part of a homogeneous mixture is most often than not the a. solvent

This depends on the type of homogeneous mixture at hand. For a liquid-solid homogeneous mixture, the liquid works as the solvent. For a gas-liquid homogeneous mixture, the liquid often works as the solvent as well. However, for a liquid-liquid homogeneous mixture, the liquid acts as both the solute and solvent.

When compared with the energy of an electron in the first shell of a carbon atom, the energy of an electron in the second shell of a carbon atom is(1) less(2) greater(3) the same

Answers

When compared with the energy of an electron in the first shell of a carbon atom, the energy of an electron in the second shell of a carbon atom is $\boxed{\left( {\text{2}} \right){\text{ greater}}}$ .

Further explanation:

Quantum numbers:

Quantum numbers govern the size, energy, shape, and orientation of an orbital. The four quantum numbers are as follows:

1. Principal Quantum Number (n): It denotes the principle electron shell. The values of n are positive integers (1, 2, 3,…).

2. Angular Momentum Quantum Number (l): It represents the shape of an orbital. The value of l is an integer from 0 to (n-1).

3. Magnetic Quantum Number $\left( {{m_l}} \right)$ : This quantum number represents the orientation of the orbital in space. The value of ${m_l}$ lies between –l to +l. The formula to calculate the value of ${m_l}$ is as follows:

${m_l} = - l,( - l + 1),.....,0,1,2,.....,(l - 1),l$

Therefore, the total number of ${m_l}$ values for a given value of l is 2l+1.

4. Electron Spin Quantum Number $({m_s})$ : It represents the direction of the electron spin. Its value can be $+ (1)/(2)$ or $- (1)/(2)$ .

The formula to calculate the energy of an electron in an atom is as follows:

${{\text{E}}_{\text{n}}} = \frac{{ - 13.6{{\text{Z}}^2}}}{{{{\text{n}}^{\text{2}}}}}{\text{eV}}$ …… (1)

Here,

E is the energy of an electron.

Z is the atomic number of atom.

n is the principal quantum number.

Calculation of energy of an electron in the first shell of carbon atom.

The value of Z is 6.

The value of n is 1.

Substitute these values in equation (1) to calculate the energy of electron in the first shell.

$\begin{aligned}{{\text{E}}_2}&=\frac{{ - 13.6{{\left( 6 \right)}^2}}}{{{{\left( 1 \right)}^{\text{2}}}}}{\text{eV}}\n&=\boxed{-489.6\;{\text{eV}}}\n\end{aligned}$

Calculation of energy of an electron in the second shell of carbon atom.

The value of Z is 6.

The value of n is 2.

Substitute these values in equation (1) to calculate the energy of an electron in the second shell.

$\begin{aligned}{{\text{E}}_1}&=\frac{{-13.6{{\left( 6 \right)}^2}}}{{{{\left( 2 \right)}^{\text{2}}}}}{\text{eV}\n&=\boxed{-122.{\text{4 eV}}}\n\end{aligned}$

The negative sign in the energy of the electron in both the shells indicates that the electron is bound to the nucleus of an atom. So the energy of electron in the second shell of carbon atom is greater than its energy in the first shell of carbon atom and therefore option (2) is correct.

Learn more:

1. Which transition is associated with the greatest energy change? brainly.com/question/1594022

2. Describe the spectrum of elemental hydrogen gas: brainly.com/question/6255073

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: energy of electron, n^2, Z^2, -13.6, n, Z, -122.4 eV, -489.6 eV, 6, 1, 2, first shell, second shell.

The answer is (2) greater. The energy of an electron will increase when the number of valence shell increases. So the energy of an electron in the second shell of a carbon atom is greater than in the first shell.

A girl throws a rock into a pond. A leaf floating on the pond bobs up and down but does not change location on the pond's surface. Why not?

Answers

This is due to the difference in density. The rock is denser than the leaf. And also, the rock is denser than the liquid in the pond. If the material is denser than the other material, it will sink. The same holds true for the rock, it sinks. But when the material is less dense than the other material, it floats. And it holds true for the leaf, it floats.

The number of neutrons in the nucleus of an atom can be determined by(1) adding the atomic number to the mass number
(2) subtracting the atomic number from the mass number
(3) adding the mass number to the atomic mass
(4) subtracting the mass number from the atomic number

Answers

Option no. 2 subtracting the atomic number from the mass number

Example: Zn - 65 atomic weight or mass/mass number
30 atomic number

65-30 = 35 number of neutrons

Which of the following shows the correct setup in converting 234 kilopascals to torr?

Answers

1 Pascal is equal to 0.008 Torr. So if you have 234 kilopascals, then

234 kilopascals ( 1000 Pascals/ 1 kilopascals) (0.008 Torr / 1 Pascal) = 1,872 Torr

A car traveled at an average speed of 60 mph for two hours. How far did it travel? A.
30 miles

B.
60 miles

C.
120 miles

D.
150 miles
i need help and please answer

Answers

C-120 hope this helps

C.) Average speed = total distance/total time. Total time= avg speed x time = 60x2 = 120miles.

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