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==Key Stage 3==
[[File:HeliumSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Helium]].]]
[[File:Helium2d.png|right|200px|thumb|A 2 dimensional representation of a [[Helium]] [[atom]] with 2 [[proton]]s (red) and two [[neutron]]s (blue) in the [[Atomic Nucleus|nucleus]] and two [[electron]]s orbiting the [[Atomic Nucleus|nucleus]] (shown as a crosscrosses).]]
===Meaning===