Q: A sodium street lamp emits light with a wavelength of $$589 \ \mathrm{nm}. $$What is the frequency of this light? (Speed of light $$c = 3.00 \times 10^8$ \ \mathrm{m/s})$$

$$5.09 \times 10$$^{14}$$ \ \mathrm{Hz}$$

Q: According to the de Broglie hypothesis, what is the wavelength of an electron (mass $$9.11 \times 10$$^{-31}$$ \ \mathrm{kg}) $$moving at $$2.00 \times 10^6$ \ \mathrm{m/s}$$? ($$h = 6.626 \times 10$$^{-34}$$ \ \mathrm{J \cdot s})$$

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

Q: A photon with a frequency of $$6.00 \times 10$$^{14}$$ \ \mathrm{Hz}$$ strikes a metal surface. What is the energy of this photon? ($$h = 6.626 \times 10$$^{-34}$$ \ \mathrm{J \cdot s})$$

$$3.98 \times 10$$^{-19}$$ \ \mathrm{J}$$

Question 1

Which of the following best explains why the Bohr model is only successful for the hydrogen atom and not for multi-electron atoms?

Accepted Answer

The Bohr model does not account for electron-electron repulsions present in multi-electron atoms.

Question 2

A sodium street lamp emits light with a wavelength of $$589 \ \mathrm{nm}. $$What is the frequency of this light? (Speed of light $$c = 3.00 	imes 10^8$ \ \mathrm{m/s})$$

Accepted Answer

$$5.09 	imes 10$$^{14}$$ \ \mathrm{Hz}$$

Question 3

Which experiment provided evidence for the quantization of energy in atoms?

Accepted Answer

The observation of line spectra from excited gas atoms.

Question 4

According to the de Broglie hypothesis, what is the wavelength of an electron (mass $$9.11 	imes 10$$^{-31}$$ \ \mathrm{kg}) $$moving at $$2.00 	imes 10^6$ \ \mathrm{m/s}$$? ($$h = 6.626 	imes 10$$^{-34}$$ \ \mathrm{J \cdot s})$$

Accepted Answer

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

Question 5

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number $$l$$

Question 6

A photon with a frequency of $$6.00 	imes 10$$^{14}$$ \ \mathrm{Hz}$$ strikes a metal surface. What is the energy of this photon? ($$h = 6.626 	imes 10$$^{-34}$$ \ \mathrm{J \cdot s})$$

Accepted Answer

$$3.98 	imes 10$$^{-19}$$ \ \mathrm{J}$$

Question 7

Which of the following sets 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 8

Which statement best describes Hund’s Rule?

Accepted Answer

Electrons fill degenerate orbitals singly with parallel spins before pairing.

Question 9

What is the maximum number of electrons that can occupy the $$n = 3$$ shell?

Accepted Answer

18

Question 10

Which of the following electron configurations represents a transition metal in its ground state?

Accepted Answer

[Ar] $$4s^2$$ $$3d^5$$

Question 11

Which of the following transitions in a hydrogen atom will emit the highest energy photon?

Accepted Answer

$$n = 3 \rightarrow n = 1$$

Question 12

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 13

A certain element has the condensed electron configuration [Kr] $$5s^2$$ $$4d^{10}$$ $$5p^5. $$Which element is this?

Accepted Answer

Iodine (I)

Question 14

Which of the following best describes the difference between a continuous spectrum and a line spectrum?

Accepted Answer

A continuous spectrum contains all wavelengths, while a line spectrum contains only specific wavelengths.

Question 15

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

Accepted Answer

Magnetic quantum number $$m_l$$

Question 16

If an electron in a hydrogen atom moves from $$n = 4 to$$ $$n = 2$$, what happens?

Accepted Answer

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

Question 17

Which of the following statements about the Heisenberg Uncertainty Principle is correct?

Accepted Answer

It is impossible to simultaneously know both the exact position and exact momentum of an electron.

Question 18

Which of the following is the correct order of filling for the sublevels in the ground state electron configuration of elements?

Accepted Answer

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p

Question 19

Which of the following best describes the shape of a $$p$$ orbital?

Accepted Answer

Two lobes with a node at the nucleus

Question 20

Which of the following elements has an anomalous electron configuration due to the stability of half-filled or fully filled $$d$$ subshells?

Accepted Answer

Chromium (Cr)

Electronic Structure of Atoms: Study Guide for General Chemistry

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