REMINDERS

Element quiz 4 today

Element quiz 5 next Friday

Bring your book on Wednesday

VALENCE ELECTRONS

PERIOD TRENDS

Elements become less like metals and more like non-metals in their properties going across periods left to right

MalleableNon-malleable

ConductiveNon-conductive

Metallic lusterdull

PERIODIC TABLE: REACTIVITY

VALENCE ELECTRONS

Definition: electrons that occupy the highest

energy level (shell) of an atom

Or:

Electrons on the outer most ring

VALENCE ELECTRONS

The most important electrons

Responsible for interaction between atoms

Electrons are very superficial

They only care about what’s on the outside

Responsible for the chemical properties of the

atom

EXAMPLES

EXAMPLES

PRACTICE FINDING VALENCE ELECTRONS

Beryllium

Nitrogen

Neon

Potassium

Chromium