Q: A sodium lamp emits light at a wavelength of $$589.0\ \text{nm}. $$What is the frequency ($$\nu) of $$this light? ($$c = 2.998 \times 10^8$\ \text{m/s})$$

$$5.09 \times 10$$^{14}$$\ \text{s}^{-1}$$

Q: According to the Bohr model, what is the energy of an electron in the $$nth $$energy level of a hydrogen atom?

$$E_n = \frac{-2.178 \times 10$$^{-18}$$\ (Z^2$)}{n^2$}\ \text{J}$$

Q: A photon has a frequency of $$4.54 \times 10$$^{14}$$\ \text{s}^{-1}. $$What is its wavelength in meters? ($$c = 2.998 \times 10^8$\ \text{m/s})$$

$$6.60 \times 10$$^{-7}$$\ \text{m}$$

Q: What is the energy of a photon with a frequency of $$5.09 \times 10$$^{14}$$\ \text{s}^{-1}$$? ($$h = 6.626 \times 10$$^{-34}$$\ \text{J} \cdot \text{s})$$

$$3.37 \times 10$$^{-19}$$\ \text{J}$$

Question 1

Which of the following best describes the relationship between wavelength ($$\lambda$$), frequency ($$
u$$), and the speed of light ($$c$$)?

Accepted Answer

$$c = \lambda 
u$$

Question 2

A sodium lamp emits light at a wavelength of $$589.0\ 	ext{nm}. $$What is the frequency ($$
u) of $$this light? ($$c = 2.998 	imes 10^8$\ 	ext{m/s})$$

Accepted Answer

$$5.09 	imes 10$$^{14}$$\ 	ext{s}^{-1}$$

Question 3

Which of the following statements about the atomic emission spectrum of hydrogen is correct?

Accepted Answer

It contains only specific wavelengths, indicating quantized energy levels.

Question 4

According to the Bohr model, what is the energy of an electron in the $$nth $$energy level of a hydrogen atom?

Accepted Answer

$$E_n = \frac{-2.178 	imes 10$$^{-18}$$\ (Z^2$)}{n^2$}\ 	ext{J}$$

Question 5

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli Exclusion Principle

Question 6

Why does atomic radius generally decrease across a period from left to right?

Accepted Answer

Effective nuclear charge increases, pulling electrons closer to the nucleus.

Question 7

Which of the following best explains why it takes more energy to remove an electron from $$	ext{Al}^+$$ than from neutral Al?

Accepted Answer

The remaining electrons experience a greater effective nuclear charge after one electron is removed.

Question 8

A photon has a frequency of $$4.54 	imes 10$$^{14}$$\ 	ext{s}^{-1}. $$What is its wavelength in meters? ($$c = 2.998 	imes 10^8$\ 	ext{m/s})$$

Accepted Answer

$$6.60 	imes 10$$^{-7}$$\ 	ext{m}$$

Question 9

Which of the following is a correct electron configuration for Germanium (Ge)?

Accepted Answer

$$[Ar]\ 4s^2$\ 3d$$^{10}$$\ 4p^2$

Question 10

Which of the following best describes Hund's Rule?

Accepted Answer

Electrons fill degenerate orbitals singly before pairing up.

Question 11

Which region of the electromagnetic spectrum has the shortest wavelength?

Accepted Answer

Gamma rays

Question 12

What is the energy of a photon with a frequency of $$5.09 	imes 10$$^{14}$$\ 	ext{s}^{-1}$$? ($$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J} \cdot 	ext{s})$$

Accepted Answer

$$3.37 	imes 10$$^{-19}$$\ 	ext{J}$$

Question 13

Which of the following best explains why the 2d orbital does not exist?

Accepted Answer

For $$n=2$$, the only allowed values of $$l$$ are 0 and 1, corresponding to s and p orbitals.

Question 14

Which of the following statements about ionization energy is correct?

Accepted Answer

It generally increases across a period due to increasing effective nuclear charge.

Question 15

Which equation correctly represents Coulomb's Law for the force between two charges?

Accepted Answer

$$F = \frac{kq_1q_2}{d^2$}$$

Question 16

Which of the following best describes the difference between core and valence electrons?

Accepted Answer

Core electrons are closer to the nucleus and do not generally participate in chemical reactions.

Question 17

Which of the following is the correct shorthand (noble gas) electron configuration for Strontium (Sr)?

Accepted Answer

$$[Kr]\ 5s^2$

Question 18

Which of the following best explains why the effective nuclear charge ($$Z_{	ext{eff}}) $$increases across a period?

Accepted Answer

The number of protons increases while the shielding effect remains relatively constant.

Atomic Structure and Periodic Trends: Mini-Textbook Study Notes for GOB Chemistry

Study Guide - Practice Questions

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