Question 1

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

Accepted Answer

$c = \lambda 
u$

Question 2

A photon of light has a frequency of $6.0 	imes 10^{14}$ Hz. What is its energy in joules? ($h = 6.626 	imes 10^{-34}$ J·s)

Accepted Answer

$3.98 	imes 10^{-19}$ J

Question 3

Which phenomenon provided evidence that electromagnetic radiation can behave as both a wave and a particle?

Accepted Answer

Photoelectric effect

Question 4

According to the Bohr model, what happens when an electron in a hydrogen atom transitions from $n=3$ to $n=2$?

Accepted Answer

A photon is emitted

Question 5

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($l$)

Question 6

What is the maximum number of electrons that can occupy a single orbital?

Accepted Answer

2

Question 7

Which rule states that electrons fill degenerate orbitals singly before pairing?

Accepted Answer

Hund's Rule

Question 8

What is the condensed electron configuration for potassium (atomic number 19)?

Accepted Answer

[Ar] 4s^1

Question 9

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

Accepted Answer

Magnetic quantum number ($m_l$)

Question 10

What is the wavelength of an electron (mass $9.11 	imes 10^{-31}$ kg) moving at $2.2 	imes 10^6$ m/s? ($h = 6.626 	imes 10^{-34}$ J·s)

Accepted Answer

$3.3 	imes 10^{-10}$ m

Question 11

Which of the following is true for a hydrogen atom according to quantum mechanics?

Accepted Answer

All orbitals with the same principal quantum number ($n$) have the same energy

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

Which orbital type has a spherical shape?

Accepted Answer

s orbital

Question 14

How many possible values of $m_l$ are there for a $d$ orbital?

Accepted Answer

5

Question 15

Which element has the electron configuration $[Xe] 4f^{14} 5d^{10} 6s^2 6p^3$?

Accepted Answer

Bismuth

Question 16

What is the main difference between the Bohr model and the quantum-mechanical model of the atom?

Accepted Answer

The Bohr model describes electrons in fixed orbits, while the quantum-mechanical model describes electrons in probabilistic orbitals

Question 17

Which quantum number can have values of $+\frac{1}{2}$ or $-\frac{1}{2}$?

Accepted Answer

Spin quantum number ($m_s$)

Question 18

Which of the following is a real-world application of the photoelectric effect?

Accepted Answer

Solar panels generating electricity from sunlight

Question 19

Which of the following elements is a lanthanide, characterized by electrons entering the $4f$ sublevel?

Accepted Answer

Cerium (Ce)

Question 20

If an atom has the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5$, which element is it and why is this configuration considered an anomaly?

Accepted Answer

Chromium; because half-filled $d$ orbitals are more stable

Electronic Structure of Atoms – Chapter 6 Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards