Question 1

Which statement best describes the difference between the Bohr model and the quantum mechanical model of the atom?

Accepted Answer

The Bohr model describes electrons as particles in fixed orbits, while the quantum mechanical model describes electrons as existing in regions of probability called orbitals.

Question 2

What is the principal quantum number $n$ primarily responsible for in the quantum mechanical model of the atom?

Accepted Answer

It determines the size and energy level of the orbital.

Question 3

Which set of quantum numbers is valid for a 3d orbital?

Accepted Answer

$n = 3$, $l = 2$, $m_l = 2$

Question 4

How many different orbitals are possible for $n = 4$ in the quantum mechanical model?

Accepted Answer

16

Question 5

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number $l$

Question 6

For a $p$ orbital, what are the possible values of the angular momentum quantum number $l$?

Accepted Answer

$l = 1$

Question 7

If $n = 2$, what are all possible values for $l$ and $m_l$?

Accepted Answer

$l = 0, 1$; $m_l = 0$ for $l = 0$, $m_l = -1, 0, 1$ for $l = 1$

Question 8

How many $d$ orbitals are present in a given energy level?

Accepted Answer

5

Question 9

Which of the following best explains why certain radii in hydrogen atom orbitals (such as 1s, 2s, 3s) have zero probability of finding an electron?

Accepted Answer

The wavefunction for the electron has nodes at those radii, resulting in zero probability.

Question 10

What is the total number of possible $m_l$ values for an $f$ orbital?

Accepted Answer

7

Question 11

A hospital uses MRI technology, which relies on the quantum mechanical properties of hydrogen nuclei. Which quantum number is most directly related to the energy levels involved in MRI?

Accepted Answer

Principal quantum number $n$

Question 12

Which of the following is true about the shapes of atomic orbitals?

Accepted Answer

The shape of an orbital is determined by the angular momentum quantum number $l$.

Question 13

How many different $p$ orbitals exist in a given energy level?

Accepted Answer

3

Question 14

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

Accepted Answer

Magnetic quantum number $m_l$

Question 15

If an electron is described by $n = 3$, $l = 2$, $m_l = -2$, which type of orbital is it in?

Accepted Answer

3d

Question 16

What is the maximum number of orbitals that can exist for $n = 2$?

Accepted Answer

6

Question 17

Which quantum number is NOT needed to specify a unique orbital in the quantum mechanical model?

Accepted Answer

Spin quantum number $m_s$

Question 18

A chemist is studying the probability distribution of an electron in a hydrogen atom. Which concept from quantum mechanics best explains the probability of finding the electron at a certain distance from the nucleus?

Accepted Answer

The probability is given by the square of the wavefunction, $|\psi|^2$.

Question 19

Which of the following is a correct statement about the relationship between $n$ and the number of orbitals?

Accepted Answer

The number of orbitals for a given $n$ is $n^2$.

Quantum Mechanics and Electron Configurations: Atomic Orbitals and Quantum Numbers

Study Guide - Practice Questions

Study Guide - Flashcards