Lesson check - Electron Configuration

How many electrons can the third energy level hold?

• 2

• 18

• 8
• 0

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Tags

NGSS.HS-PS1-1

Identify the Electron Configuration for Aluminum (Al)

• 1s² 2s² 2p⁶ 3s² 3p¹

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 4p¹

Tags

NGSS.HS-PS1-1

This orbital diagram represents:  

• C
• B
• N
• O

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which orbital is displayed correctly?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

After the 3p orbital has been filled with electrons, why is the next electron added to the 4s orbital instead of 3d orbital?

• difference in shape of orbital

• the first ionisation is increasing across the period

• the first ionisation is decreasing going down the group

• 4s is lower in energy even though it has a higher principal quantum number

Tags

NGSS.HS-PS1-1

The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is 

• 3
• 6
• 8
• 10

Valence electrons are located...

• inside the nucleus

• on the outermost (highest energy level) s p, and d sublevels

• on the outermost (highest energy level) s and p sublevels

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Electrons occupy orbitals of lowest energy first is part of what electron configuration rule?

• Hund’s Rule
• Aufbau Principle
  
• Pauli Exclusion Principle

Electrons are paired based on their spin directions, one up and one down to represent opposite spins, is what electron configuration rule?

• Hund’s Rule
• Aufbau Principle
  
• Pauli Exclusion Principle