Q: A photon of green light has a wavelength of $$520\ \mathrm{nm}. $$What is its frequency? (Speed of light $$c = 3.00 \times 10^8$\ \mathrm{m/s})$$

$$5.77 \times 10$$^{14}$$\ \mathrm{Hz}$$

Q: Calculate the wavelength of an electron (mass $$9.11 \times 10$$^{-31}$$\ \mathrm{kg}) $$moving at $$2.00 \times 10^6$\ \mathrm{m/s}$$ using the de Broglie equation.

$$3.63 \times 10$$^{-10}$$\ \mathrm{m}$$

Question 1

Which of the following correctly describes the relationship between wavelength ($$\lambda) $$and frequency ($$
u) of $$electromagnetic radiation?

Accepted Answer

They are inversely proportional: as wavelength increases, frequency decreases.

Question 2

A photon of green light has a wavelength of $$520\ \mathrm{nm}. $$What is its frequency? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$5.77 	imes 10$$^{14}$$\ \mathrm{Hz}$$

Question 3

Which equation would you use to calculate the energy of a photon given its frequency?

Accepted Answer

$$E = h
u$$

Question 4

The photoelectric effect provided evidence for which property of light?

Accepted Answer

Its particle-like nature

Question 5

Which of the following best describes a line spectrum?

Accepted Answer

A spectrum that contains only specific wavelengths of light

Question 6

In the Bohr model, which electron transition emits the highest energy photon?

Accepted Answer

From $$n=2 to$$ $$n=1$$

Question 7

Calculate the wavelength of an electron (mass $$9.11 	imes 10$$^{-31}$$\ \mathrm{kg}) $$moving at $$2.00 	imes 10^6$\ \mathrm{m/s}$$ using the de Broglie equation.

Accepted Answer

$$3.63 	imes 10$$^{-10}$$\ \mathrm{m}$$

Question 8

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number $$l$$

Question 9

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 10

Which of the following describes an electron in a 2p orbital?

Accepted Answer

$$n=2,\ l=1,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 11

Which quantum number is responsible for the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number $$m_l$$

Question 12

What is the electron configuration for the ground state of phosphorus ($$Z=15$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^3$$

Question 13

How many unpaired electrons are present in the ground state of a nitrogen atom ($$Z=7$$)?

Accepted Answer

3

Question 14

Which of the following best explains why the 4s subshell is filled before the 3d subshell?

Accepted Answer

The 4s subshell has lower energy due to electron shielding.

Question 15

Which element has the largest atomic radius among the following?

Accepted Answer

Na

Question 16

Which of the following atoms is expected to be the smallest in size?

Accepted Answer

Br

Question 17

Which of the following is the correct noble gas core electron configuration for calcium ($$Z=20$$)?

Accepted Answer

$$[Ar]\ 4s^2$

Question 18

Which of the following statements about the periodic trend in atomic radii is correct?

Accepted Answer

Atomic radius decreases from left to right across a period.

Question 19

Which of the following sets of quantum numbers describes an electron in a 3d orbital?

Accepted Answer

$$n=3,\ l=2,\ m_l=1,\ m_s=+\frac{1}{2}$$

Question 20

Which block of the periodic table contains the elements with their last electron entering a p orbital?

Accepted Answer

p block

Electronic Structure of Atoms and Periodicity: Chapter 5 Study Notes

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