: 2Li + F<sub>2</sub> → 2LiF
|}
'''Lithium + Fluorine → Lithium Fluoride'''
: _Li + _F<sub>2</sub> → _LiF
: Reactants = Products
: 1Li = 1Li
: 2F ≠ 1F
We need 2 [[Fluorine]] [[atom]]s in the [[product]]s.
: _Li + _F<sub>2</sub> → 2LiF
: Reactants = Products
: 1Li ≠ 2Li
: 2F = 2F
There are now too many [[Lithium]] [[atom]]s in the [[product]]s so we need 2 in the [[reactant]]s.
: 2Li + _F<sub>2</sub> → 2LiF
: Reactants = Products
: 2Li = 2Li
: 2F = 2F
This equation is balanced: '''2Li + F<sub>2</sub> → 2LiF'''
'''Aluminium + Chlorine → Aluminium Chloride'''