Final Concepts

Question 1

Model for the Metallic Bond

Answer 1

Cations fixed in a lattice (solid)

Extreme delocalized e- density
(“sea of electrons”)

Question 2

Model for the Ionic Bond

Answer 2

• attraction between cations (+) and anions (-)
• e- transfer & charge separation
• strong electrostatic attraction

Question 3

Model for the Covalent/Molecular Bond

Answer 3

• shared pair(s) of electrons attracted to nuclei
• fully shared valence e- pairs

Question 4

Trends in ion size

Answer 4

• Cations contract
• Anions add

Question 5

Electronegativity Definition

Answer 5

Electronegative elements are greedy for electrons.

Question 6

Diamagnetic

Answer 6

Paired electrons

Question 7

Paramagnetic

Answer 7

unpaired electrons

Question 8

Bond energy concepts

Answer 8

It takes energy to break bonds (“+”) and so forming bonds gives off energy (“-“)