Electron Configuration Basics and Practice Problems

What is the atomic number of Nitrogen?

• 5

• 8

• 6

• 7

How many electrons can the 2P sublevel hold?

• 4

• 6

• 2

• 8

What is the electron configuration for an atom of Nitrogen?

• 1s2 2s2 2p3

• 1s2 2s2 2p4

• 1s2 2s2 2p5

• 1s2 2s2 2p6

How many electrons does an atom of Aluminum have?

• 10

• 11

• 12

• 13

What is the ground state electron configuration for an atom of Aluminum?

• 1s2 2s2 2p6 3s2 3p1

• 1s2 2s2 2p6 3s2 3p2

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p6 3s2 3p4

What is the atomic number of Iron (Fe)?

• 26

• 25

• 27

• 24

How many electrons does the Fe 2+ ion have?

• 25

• 24

• 23

• 22

What is the electron configuration for the Fe 2+ ion?

• 1s2 2s2 2p6 3s2 3p6 3d6

• 1s2 2s2 2p6 3s2 3p6 3d5

• 1s2 2s2 2p6 3s2 3p6 3d4

• 1s2 2s2 2p6 3s2 3p6 3d3

How many electrons does a Chloride ion (Cl-) have?

• 18

• 17

• 19

• 16

What is the electron configuration for the Chloride ion (Cl-)?

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p6

• 1s2 2s2 2p6 3s2 3p4