$\text{1s:} \uparrow\downarrow\ \text{2s:} \uparrow\downarrow\ \text{2p:} \uparrow\downarrow\uparrow$

$\text{1s:} \uparrow\downarrow\ \text{2s:} \uparrow\ \text{2p:} \uparrow\downarrow$

Question 1

Which of the following electron configurations violates Hund's Rule?

Accepted Answer

$	ext{1s:} \uparrow\downarrow\ 	ext{2s:} \uparrow\downarrow\ 	ext{2p:} \uparrow\downarrow\uparrow$

Question 2

According to the Aufbau Principle, which orbital is filled first?

Accepted Answer

$1s$

Question 3

Which of the following electron configurations violates the Aufbau Principle?

Accepted Answer

$	ext{1s:} \uparrow\downarrow\ 	ext{2s:} \uparrow\ 	ext{2p:} \uparrow\downarrow$

Question 4

How many unpaired electrons are present in a nitrogen atom ($Z = 7$)?

Accepted Answer

$3$

Question 5

Which element has the electron configuration $1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^4$?

Accepted Answer

Sulfur

Question 6

What is the ground state electron configuration for magnesium ($Z = 12$)?

Accepted Answer

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

Question 7

Which of the following atoms has the most unpaired electrons?

Accepted Answer

Phosphorus

Question 8

If an atom has the electron configuration $1s^2\ 2s^2\ 2p^5$, how many unpaired electrons does it have?

Accepted Answer

$1$

Question 9

Which statement best describes degenerate orbitals?

Accepted Answer

Orbitals with the same energy in the same subshell

Question 10

Which of the following is a correct application of Hund's Rule?

Accepted Answer

Electrons fill each orbital singly before pairing in degenerate orbitals

Question 11

A fluorine atom ($Z = 9$) has which ground state electron configuration?

Accepted Answer

$1s^2\ 2s^2\ 2p^5$

Question 12

Which of the following elements has no unpaired electrons in its ground state?

Accepted Answer

Calcium

Question 13

Which electron configuration represents a violation of the Pauli Exclusion Principle?

Accepted Answer

$	ext{1s:} \uparrow\uparrow$

Question 14

Which principle explains why electrons fill the lowest energy orbitals first?

Accepted Answer

Aufbau Principle

Question 15

How many electrons can a p orbital hold?

Accepted Answer

$2$

Question 16

Which of the following elements has the electron configuration $1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^5$?

Accepted Answer

Chlorine

Question 17

What is the maximum number of electrons that can occupy the 2p subshell?

Accepted Answer

$6$

Question 18

Which of the following is true about paired electrons?

Accepted Answer

They have opposite spins

Question 19

Which element has the electron configuration $1s^2\ 2s^2\ 2p^3$?

Accepted Answer

Nitrogen

Question 20

If an atom has the electron configuration $1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^3$, how many unpaired electrons does it have?

Accepted Answer

$3$

Electron Configurations and Orbital Diagrams in GOB Chemistry

Study Guide - Practice Questions