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===About Chemical Symbols===
: [[Chemical Symbol]]s are used to write [[Chemical Formula|chemical formulae]] and [[Balanced Symbol Equation]]s.
: Most [[Chemical Symbol]]s use the letters in their name for the symbol but some use letters from their old names. An example of this is [[Lead]] which has the symbol [[Pb]] because it used to be called 'plumbum'.
In a [[Chemical Formula|chemical formula]] the '''chemical symbols''' are written together with numbers to represent the number of each [[element]] in that [[chemical]].
*MgBr<sub>2</sub>: [[Magnesium Bromide]] with one [[Magnesium]] [[atom]] and two [[Bromine]] [[atom]]s.
*CO<sub>2</sub>: [[Carbon Dioxide]] with one [[Carbon]] [[atom]] and two [[Oxygen]] [[atom]]s.
*Li<sub>2</sub>O: [[Lithium Oxide]] with two [[Lithium]] [[atom]]s and one [[Oxygen]] [[atom]].