What are valence electrons?

• The innermost electrons

• The outermost electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

This is a correct dot diagram for fluorine (F)

• true
• false

Tags

NGSS.HS-PS1-1

Hydrogen needs _____ electrons in its valence shell to be stable.

• 4
• 6
• 8
• 2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

According to the octet rule most elements need _______ valence electrons.

• 2
• 8
• 6
• 18

Tags

NGSS.HS-PS1-1

What is the correct Lewis Dot Structure for ammonia NH₃

• 
• 
• 
• 

Which is the correct Lewis structure for carbon dioxide?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many total electrons are participating in bonding in the molecule CH₂O?

• 8

• 4

• 2

• 3

 A lone pair is defined as

• A pair of bonding electrons
• One non-bonding electron
• A pair of non-bonding electrons
• A pair of electrons on the central atom

NH₃ has how many lone pairs?

• 0

• 1

• 2

• 3

Tags

NGSS.HS-PS1-1

Choose the correct shape for this molecule:

• Trigonal planar

• Trigonal pyramidal

• Bent

• Tetrahedral