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

$c = \lambda 	imes 
u$

Question 2

A photon has a frequency of $6.0 	imes 10^4$ Hz. What is its wavelength in nanometers ($nm$)? (Speed of light $c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$5.0 	imes 10^9$ nm

Question 3

Which statement about the photoelectric effect is correct?

Accepted Answer

Electrons are ejected from a metal surface only if the incident light has a frequency above a certain threshold.

Question 4

Planck introduced the concept of the quantum to explain which phenomenon?

Accepted Answer

The emission and absorption of energy in discrete units by atoms and molecules.

Question 5

What is the energy (in joules) of a photon with a wavelength of $0.154$ nm? ($h = 6.63 	imes 10^{-34}$ J·s, $c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$1.29 	imes 10^{-15}$ J

Question 6

According to Bohr’s model, what happens when an electron in a hydrogen atom moves from $n=5$ to $n=3$?

Accepted Answer

A photon is emitted with energy equal to the difference between the two energy levels.

Question 7

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

Accepted Answer

Magnetic quantum number ($m_l$)

Question 8

How many electrons can occupy a single orbital?

Accepted Answer

2

Question 9

Which of the following electron configurations represents a diamagnetic atom in its ground state?

Accepted Answer

Ne: $1s^2 2s^2 2p^6$

Question 10

Which rule states that the most stable arrangement of electrons in subshells is the one with the greatest number of parallel spins?

Accepted Answer

Hund's rule

Question 11

What is the electron configuration of magnesium (Mg)?

Accepted Answer

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

Question 12

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

Accepted Answer

$n=2, l=2, m_l=+1$

Question 13

If the threshold frequency for the photoelectric effect in cadmium is $9.83 	imes 10^{14}$ Hz, what is the corresponding wavelength?

Accepted Answer

$3.05 	imes 10^{-7}$ m$

Question 14

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 15

Which orbital can hold a maximum of 10 electrons?

Accepted Answer

d orbital

Question 16

What is the possible set of quantum numbers for the outermost electron in chlorine (Cl)?

Accepted Answer

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

Question 17

Which of the following best explains why the Schrodinger equation can be solved exactly only for the hydrogen atom?

Accepted Answer

Hydrogen has only one electron, so electron-electron interactions are absent.

Question 18

Which of the following atoms has a ground-state electron configuration that is paramagnetic?

Accepted Answer

Boron (B)

Question 19

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number ($l$)

Quantum Theory and the Electronic Structure of Atoms (Chapter 8 Study Notes)

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