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→About Chemical Formulae
: '''Chemical Formulae''' show which [[element]]s are in a [[molecule]].
: The number of each [[element]] in a [[molecule]] is shown with subscript after that [[element]].
: Some '''chemical formulae''' have brackets which indicate that the [[element]]s in the bracket are multiplied by the number after the bracket.
*MgBr<sub>2</sub>: [[Magnesium Bromide]] with 1 [[Magnesium]] [[atom]] and 2 [[Bromine]] [[atom]]s.
*CO<sub>2</sub>: [[Carbon Dioxide]] with 1 [[Carbon]] [[atom]] and 2 [[Oxygen]] [[atom]]s.
*Li<sub>2</sub>O: [[Lithium Oxide]] with 2 [[Lithium]] [[atom]]s and 1 [[Oxygen]] [[atom]].
*Al(OH)<sub>3</sub>: [[Aluminium Hydroxide]] with 1 [[Aluminium]] [[atom]], with 3 lots of OH; 3 [[Oxygen]] [[atom]]s and 3 [[Hydrogen]] [[atom]]s.
*Al<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub>: [[Aluminium Carbonate]] with 2 [[Aluminium]] [[atom]]s, and 3 lots of CO<sub>3</sub>; 3 [[Carbon]] [[atom]]s and 9 [[Oxygen]] [[atom]]s.
Some '''chemical formulae''' are written with the [[element]]s at specific points, not all grouped together, to show where different [[element]]s are [[Chemical Bond|bonded]]. This is called a [[Structural Formula|structural formula]].