$\lambda = 5.0 \times 10^{-7}$ m

Question 1

Which statement best describes Bohr’s model of the atom?

Accepted Answer

Electrons orbit the nucleus in fixed energy levels, and can only gain or lose energy by jumping between these levels.

Question 2

What is the relationship between the frequency ($f$) and wavelength ($\lambda$) of a wave, given the speed of light ($c$)?

Accepted Answer

$c = f 	imes \lambda$

Question 3

An electron in a hydrogen atom absorbs energy and moves from the ground state to an excited state. What happens next?

Accepted Answer

The electron releases energy as a photon and returns to a lower energy level.

Question 4

Which of the following best explains the difference between the quantum mechanical model and Bohr’s model of the atom?

Accepted Answer

Bohr’s model describes electrons in fixed orbits, while the quantum model describes electrons as existing in probability clouds called orbitals.

Question 5

If the frequency of a wave is $6.0 	imes 10^{14}$ Hz and the speed of light is $3.0 	imes 10^8$ m/s, what is the wavelength ($\lambda$) of the wave?

Accepted Answer

$\lambda = 5.0 	imes 10^{-7}$ m

Question 6

Which principle states that electrons fill the lowest available energy levels before occupying higher levels?

Accepted Answer

Aufbau Principle

Question 7

What is the energy ($E$) of a photon with a frequency ($f$) of $5.0 	imes 10^{15}$ Hz? Use Planck’s constant $h = 6.63 	imes 10^{-34}$ J·s.

Accepted Answer

$E = 3.32 	imes 10^{-18}$ J

Question 8

Which of the following sublevels can exist in the third energy level ($n=3$) of an atom?

Accepted Answer

s, p, and d

Question 9

A sodium atom emits light with a wavelength of $589$ nm. What is the frequency ($f$) of this light? ($c = 3.0 	imes 10^8$ m/s)

Accepted Answer

$f = 5.09 	imes 10^{14}$ Hz

Question 10

Which of the following best describes the electromagnetic spectrum (EMS)?

Accepted Answer

It is a range of all possible frequencies and wavelengths of electromagnetic radiation.

Question 11

Which quantum number ($n$) primarily determines the energy level of an electron in an atom?

Accepted Answer

Principal quantum number

Question 12

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

1s$^2$ 2s$^2$ 2p$^4$

Question 13

Which rule states that electrons will fill degenerate orbitals singly before pairing up?

Accepted Answer

Hund’s Rule

Question 14

What is the maximum number of electrons that can be accommodated in the $p$ sublevel?

Accepted Answer

6

Question 15

Which of the following best describes the ground state of an atom?

Accepted Answer

The atom has its electrons in the lowest possible energy levels.

Question 16

A photon of light has a wavelength of $400$ nm. What is its energy ($E$)? ($h = 6.63 	imes 10^{-34}$ J·s, $c = 3.0 	imes 10^8$ m/s)

Accepted Answer

$E = 4.97 	imes 10^{-19}$ J

Question 17

Which of the following is NOT a correct metric prefix for frequency?

Accepted Answer

centi

Question 18

Which of the following statements about electron configuration is TRUE?

Accepted Answer

Electrons fill orbitals in order of increasing energy, following the Aufbau Principle.

Question 19

Which block of the periodic table contains elements whose valence electrons are in $d$ orbitals?

Accepted Answer

d-block

Question 20

Which of the following best describes the process of emission in the context of atomic spectra?

Accepted Answer

An electron releases energy as a photon and moves to a lower energy level.

Atomic Structure, Waves, and Electron Configuration: General Chemistry Study Notes

Study Guide - Practice Questions