Ionic Bonding

A Chemical Reaction: Movement of electrons between combining atoms that results in the formation of a NEW substance. *The LESS electrons to move, the GREATER the reactivity of the element.

Attractive forces hold opposite charges together – IONIC BOND. Ionic Compounds - a positive ion (METAL) joins with a negative ion (NON-METAL). Attractive forces hold opposite charges together – IONIC BOND.

- + Sodium atom (Na) Chlorine atom (Cl) Sodium ion (Na+) Chlorine ion (Cl-) Sodium Chloride NaCl (ionic bond)

Atoms combine together to form compounds in fixed ratios or definite proportions. 1 Na forms an ionic bond with 1 Cl 10 Na 10 Cl 65 Na 65 Cl The smallest unit of an ionic compound is called a formula unit.

Ionic Compounds formula unit

1 : 1 AlN N-3 Al+3 As atoms combine in definite proportions: Aluminum Nitrogen N-3 Al+3 Aluminum Nitride 1 : 1 AlN

1 : 3 AlF3 3 F- Al+3 As atoms combine in definite proportions: Aluminum Fluorine 3 F- Al+3 1 : 3 Aluminum Fluoride AlF3

Use Bohr diagrams to illustrate the compounds formed from the following reaction: Ca and F Na and P Mg and N