Q: A photon has a wavelength of $$105\ \text{nm}. $$What is its energy in joules? (Use $$h = 6.626 \times 10$$^{-34}$$\ \text{J} \cdot \text{s}$$ and $$c = 3.00 \times 10^8$\ \text{m/s})$$

$$1.89 \times 10$$^{-18}$$\ \text{J}$$

Question 1

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

Accepted Answer

$$c = \lambda 
u$$

Question 2

A photon has a wavelength of $$105\ 	ext{nm}. $$What is its energy in joules? (Use $$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J} \cdot 	ext{s}$$ and $$c = 3.00 	imes 10^8$\ 	ext{m/s})$$

Accepted Answer

$$1.89 	imes 10$$^{-18}$$\ 	ext{J}$$

Question 3

Which phenomenon cannot be explained by the wave nature of light alone?

Accepted Answer

The photoelectric effect

Question 4

According to the Bohr model, what happens when an electron transitions from a higher energy level ($$n_i) to a $$lower energy level ($$n_f$$)?

Accepted Answer

A photon is emitted and $$\Delta E is $$negative

Question 5

Which equation describes the energy of a photon in terms of its frequency ($$
u) $$and Planck's constant ($$h$$)?

Accepted Answer

$$E = h 
u$$

Question 6

What is the principal quantum number ($$n) $$for the third energy level in an atom?

Accepted Answer

$$n = 3$$

Question 7

Which quantum number defines the shape of an orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 8

How many electrons can occupy the $$3d$$ subshell?

Accepted Answer

10

Question 9

Which of the following is the correct condensed electron configuration for argon (atomic number 18)?

Accepted Answer

[Ne]$$3s^2$$ $$3p^6$$

Question 10

What is the maximum number of electrons that can occupy the $$n = 4$$ shell?

Accepted Answer

32

Question 11

Which quantum number describes the three-dimensional orientation of an orbital?

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 12

According to Hund’s rule, when filling degenerate orbitals, what is the lowest energy arrangement?

Accepted Answer

Maximize the number of electrons with the same spin

Question 13

Which element has the ground-state electron configuration $$[Kr]5s^1$ 4d^5$?

Accepted Answer

Mo (Molybdenum)

Question 14

What is the angular momentum quantum number ($$l) $$for a $$d$$ orbital?

Accepted Answer

$$l = 2$$

Question 15

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

Accepted Answer

Pauli Exclusion Principle

Question 16

If an electron has $$n = 7$$ and $$l = 3$$, what is the subshell designation?

Accepted Answer

7f

Question 17

Which equation expresses the de Broglie wavelength ($$\lambda) of a $$particle with mass $$m$$ and velocity $$v$$?

Accepted Answer

$$\lambda = \frac{h}{mv}$$

Question 18

How many unpaired electrons are present in a ground-state chlorine atom?

Accepted Answer

1

Question 19

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

Accepted Answer

Core electrons are in filled inner shells, valence electrons are in the outermost shell

Question 20

Which quantum number is associated with the spin of an electron?

Accepted Answer

Spin quantum number ($$m_s)$$

Electronic Structure of Atoms: Quantum Theory and Electron Configurations

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