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==Key Stage 4==
[[File:CaKS4.PNG|right|200px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Calcium]].]]
[[File:Calcium2dWK.PNG|right|200px|thumb|A 2 dimensional representation of the [[Bohr Model]] of a [[Calcium]]-40 [[isotope]] with 20 [[proton]]s and 20 [[neutron]]s in the [[Atomic Nucleus|nucleus]] and 20 [[electron]]s orbiting the [[Atomic Nucleus|nucleus]].]]
===Meaning===
[[Calcium]] is a [[Group 2]] [[element]], on the [[Periodic Table]], with 20 [[proton]]s in the [[Atomic Nucleus|nucleus]].