Atomic Structure: Electron Configuration

What is the maximum number of electrons that can occupy the 3rd energy level?

• 12

• 20

• 16

• 18

Write the electron configuration for oxygen (O).

• 1s2 2s2 2p4

• 1s2 2s1 2p5

• 1s2 2s2 2p3

• 1s2 2s3 2p3

How many electrons can fit in the p sublevel?

• 4

• 6

• 10

• 8

Explain the Aufbau principle in electron configuration.

• Electron configuration follows the Pauli exclusion principle

• Electron configuration is based on the periodic table order

• Electron configuration follows the Aufbau principle by filling orbitals in order of increasing energy levels.

• Aufbau principle states electrons fill orbitals randomly

What is the electron configuration for magnesium (Mg)?

• 1s2 2s2 2p6 3s2

• 1s2 2s2 2p5 3s2

• 1s2 2s2 2p6 3s1

• 1s2 2s2 2p6 4s1

What is the shorthand electron configuration for sulfur (S)?

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p5 3s2 3p4

• 1s2 2s2 2p6 3s1 3p4

What is the electron configuration for nitrogen (N)?

• 1s2 2s1 2p4

• 1s2 2s2 2p3

• 1s2 2s2 2p4

• 1s2 2s3 2p3

How many electrons can the d sublevel hold?

• 8

• 6

• 12

• 10

Describe the Pauli Exclusion Principle in relation to electron configuration.

• The Pauli Exclusion Principle dictates that electron configurations in an atom must follow the rule that no two electrons can have the same set of quantum numbers.

• The Pauli Exclusion Principle allows for an unlimited number of electrons in a single orbital.

• The Pauli Exclusion Principle states that electrons in an atom can have the same set of quantum numbers.

• Electron configuration follows the rule that electrons must pair up in the same orbital.

What is the electron configuration for potassium (K)?

• 1s2 2s2 2p6 3s2 3p6 4s3

• 1s2 2s2 2p6 3s2 3p6 4s2

• 1s2 2s2 2p6 3s2 3p6 4s4

• 1s2 2s2 2p6 3s2 3p6 4s1