Question 1

Which color of visible light has the highest energy, and why?

Accepted Answer

Violet, because it has the shortest wavelength.

Question 2

What is the main difference between the ground state and the excited state of an atom in the Bohr model?

Accepted Answer

The excited state has electrons in higher energy levels than the ground state.

Question 3

Which of the following electron configurations is impossible, and why?

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$2d^{10}$$

Accepted Answer

It is impossible because there is no 2d sublevel.

Question 4

Rank the following sublevels in order of increasing energy: 4s, 1s, 2p, 5p, 3d.

Accepted Answer

$$1s,\ 2p,\ 4s,\ 3d,\ 5p$$

Question 5

Given the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^1$$, how many electrons does this atom have?

Accepted Answer

13

Question 6

Which rule is violated if two electrons in the same orbital have the same spin?

Accepted Answer

Pauli Exclusion Principle

Question 7

What is the abbreviated electron configuration for silver (Ag, atomic number 47)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d$$^{10}$$

Question 8

If an atom has a mass number of 34 and the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^5$$, how many neutrons does it have?

Accepted Answer

17

Question 9

Which of the following is the correct electron filling order through 5p?

Accepted Answer

$$1s\ 2s\ 2p\ 3s\ 3p\ 4s\ 3d\ 4p\ 5s\ 4d\ 5p$$

Question 10

A student writes the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^1$$\ $$3d^7. $$What is wrong with this configuration?

Accepted Answer

4s should be filled before 3d.

Question 11

Which of the following statements is true about the energy of electrons as you move further from the nucleus?

Accepted Answer

The energy of each electron increases.

Question 12

Which electron configuration violates Hund's Rule?

Accepted Answer

A 2p sublevel with three electrons, all paired in one orbital.

Question 13

Which of the following is the correct full electron configuration for carbon (C, atomic number 6)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 14

A photon of which color of light will release the most energy when emitted by an atom?

Accepted Answer

Violet

Question 15

Which of the following is NOT a rule for electron filling order?

Accepted Answer

Dalton's Law

Question 16

If an atom has 30 protons, 36 neutrons, and 30 electrons, what is its mass number?

Accepted Answer

66

Question 17

Which of the following electron configurations is incorrect and why?

$$1s^2$$\ $$1p^6$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^9$$

Accepted Answer

It is incorrect because there is no 1p sublevel.

Question 18

Which of the following best describes the relationship between wavelength and energy for visible light?

Accepted Answer

As wavelength increases, energy decreases.

Question 19

Which of the following is the correct abbreviated electron configuration for iodine (I, atomic number 53)?

Accepted Answer

$$[Kr]\ 5s^2$\ 4d$$^{10}$$\ 5p^5$

Electronic Structure of Matter: Energy, Electron Configurations, and Atomic Properties

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