CK12 Chemistry

How many valence electrons in fluorine?

• 6

• 7

• 5

• 8

How many valence electron(s) do elements in group 14 have?

• 14

• 2

• 4

• 3

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

Na’s electron configuration is 1s²2s²2p⁶3s¹. Na has ___ valence electron(s).

• 1

• 2

• 7

• 4

Tags

NGSS.HS-PS1-1

Oxygen is located in Group 16, therefore oxygen has ___ valence electrons.

• 6

• 16

• 5

• 8

The number of valence electrons _____ as we go down a group.

• Increases

• Decreases

• Goes up and down

• Remains The same

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

• 6

• 5

• 4

• None

Tags

NGSS.HS-PS1-1

How many electrons in an atom with the electron configuration of 1s²2s²2p⁶3s¹?

• 1

• 11

• 17

• 5

What neutral element has the electron configuration described by the Aufbau diagram above. ___

• Helium

• sulfur

• Carbon

• Aluminum

Tags

NGSS.MS-PS1-1