3.2a Characteristic of ions

1. Ionic radius

Follow the logic:

Metal (left side of periodic table) = low electronegativity = lose electrons = Cation = oxidized

Non-metal is the opposite of metal = Anion = reduced (because the atom goes from 0 charge to -1, -2, -3… the number is lowered or reduced)

The wanna-be-Noble rule: everything wants to lose or gain the appropriate numbers of electrons to be like Noble gas. Why?

2. Acidic, basic or amphoteric oxide in water

Example of amphoteric oxide Al₂O₃

Acting as an acid