Lewis dot structure

How many valence electrons does an atom in Group 15 (or Group 5A) typically have?

• 3

• 4

• 5

• 6

What type of compounds are typically represented by Lewis structures?

• Ionic compounds

• Metallic compounds

• Covalent compounds

• Noble gases

How many total valence electrons are there in a molecule of CH4?

• 4

• 6

• 8

• 10

Which element is almost always the central atom in a Lewis structure if it is present in the molecule?

• Hydrogen

• Oxygen

• Carbon

• Nitrogen

How many total valence electrons are in a methane (CH4) molecule?

• 4

• 6

• 8

• 10

What does the Octet Rule state about the central atom?

• The central atom prefers to have 2 valence electrons surrounding it.

• The central atom prefers to have 4 valence electrons surrounding it.

• The central atom prefers to have 6 valence electrons surrounding it.

• The central atom prefers to have 8 valence electrons surrounding it.

How many total valence electrons are in a PCl3 molecule?

• 21

• 24

• 26

• 28

Which atom is the central atom in a PCl3 molecule?

• Chlorine

• Phosphorus

• Both can be central

• Neither is central