Electron Configuration and Valence Electrons

How many valence electrons in fluorine?

• 6

• 7

• 5

• 8

Calcium’s electron configuration is 1s²2s²2p⁶3s²3p⁶4s². Calcium has ___ valence electron(s).

• 8

• 2

• 4

• 3

Tags

NGSS.HS-PS1-1

Sulphur's electron configuration is 1s²2s²2p⁶3s²3p⁴. Sulphur has ___ valence electron(s)

• 2

• 4

• 7

• 6

• 2
• 3
• 5

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Select the elements that has 8 valence electrons.

• Ne

• Br

• Kr

• Xe

Q1. How many planets are in the solar system?

• A) 7

• B) 8

• C) 9

• D) 10

• 2
• 8
• 3
• 13

Tags

NGSS.MS-PS1-1

• 14

• 4

• 3

• 28

Tags

NGSS.MS-PS1-1

• 12
• 7
• 8
• 14

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The total number of the elements above with 2 valence electrons is ___ .

• 6

• 5

• 4

• None