Q: A photon has a frequency of $$1.821 \times 10$$^{16}$$ \ \mathrm{s}^{-1}. $$What is its energy in joules? Use $$h = 6.626 \times 10$$^{-34}$$ \ \mathrm{J \cdot s}.$$

$$E = 1.21 \times 10$$^{-17}$$ \ \mathrm{J}$$

Q: An electron in a hydrogen atom transitions from $$n = 2 to$$ $$n = 5. $$What is the energy change associated with this transition?

$$\Delta E = 4.6 \times 10$$^{-19}$$ \ \mathrm{J}$$

Q: Calculate the de Broglie wavelength of a 2.0 kg object moving at 50 m/s. Use $$h = 6.626 \times 10$$^{-34}$$ \ \mathrm{J \cdot s}.$$

$$\lambda = 6.6 \times 10$$^{-36}$$ \ \mathrm{m}$$

Question 1

Which of the following statements best describes the Pauli Exclusion Principle?

Accepted Answer

No two electrons in the same atom can have the same set of four quantum numbers.

Question 2

A photon has a frequency of $$1.821 	imes 10$$^{16}$$ \ \mathrm{s}^{-1}. $$What is its energy in joules? Use $$h = 6.626 	imes 10$$^{-34}$$ \ \mathrm{J \cdot s}.$$

Accepted Answer

$$E = 1.21 	imes 10$$^{-17}$$ \ \mathrm{J}$$

Question 3

An electron in a hydrogen atom transitions from $$n = 2 to$$ $$n = 5. $$What is the energy change associated with this transition?

Accepted Answer

$$\Delta E = 4.6 	imes 10$$^{-19}$$ \ \mathrm{J}$$

Question 4

Calculate the de Broglie wavelength of a 2.0 kg object moving at 50 m/s. Use $$h = 6.626 	imes 10$$^{-34}$$ \ \mathrm{J \cdot s}.$$

Accepted Answer

$$\lambda = 6.6 	imes 10$$^{-36}$$ \ \mathrm{m}$$

Question 5

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 6

What is the principal quantum number of the first d subshell?

Accepted Answer

$$n = 3$$

Question 7

Which of the following is an acceptable set of quantum numbers for an electron in an atom? (n, l, m, s)

Accepted Answer

3, 2, -2, -\frac{1}{2}

Question 8

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

Accepted Answer

1

Question 9

What is the condensed electron configuration of argon (element 18)?

Accepted Answer

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

Question 10

Which of the following best describes the photoelectric effect?

Accepted Answer

The ejection of electrons by a metal when struck with light of sufficient energy

Question 11

An FM radio station broadcasts at a frequency of 98.2 MHz. What is the wavelength of this radiation in meters? (Speed of light $$c = 3.00 	imes 10^8$ \ \mathrm{m/s})$$

Accepted Answer

3.055

Question 12

Which of the following orbitals can hold two electrons?

Accepted Answer

All of the above

Question 13

When an electron in a hydrogen atom moves from $$n = 4 to$$ $$n = 2$$, what is the wavelength (in nm) of the emitted light?

Accepted Answer

486

Question 14

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($$m)$$

Question 15

A scientist observes that electrons fill each degenerate orbital singly before any orbital gets a second electron. Which rule does this illustrate?

Accepted Answer

Hund's rule

Question 16

Which of the following best explains why electrons do not spiral into the nucleus according to the Bohr model?

Accepted Answer

Electrons in allowed orbitals do not radiate energy.

Question 17

Which element is best described as having two electrons in a 5s subshell and a partially filled 4d subshell?

Accepted Answer

Transition metal

Question 18

Which of the following is the correct condensed electron configuration for Bismuth (Bi)?

Accepted Answer

[Xe] $$6s^2$$ $$4f^{14}$$ $$5d^{10}$$ $$6p^3$$

Question 19

Which of the following best describes the uncertainty principle?

Accepted Answer

The more precisely the momentum of a particle is known, the less precisely its position is known.

Quantum Mechanics, Atomic Structure, and Electron Configuration: General Chemistry Study Notes

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