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==Key Stage 3==
===Meaning===
[[File:StrontiumSymbolStrontiumSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Strontium]].]]
[[Strontium]] is a [[Group 2]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 38.
===About Strontium===
==Key Stage 4==
[[File:SrKS4.PNG|right|200px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Strontium]].]]
===Meaning===
[[Strontium]] is a [[Group 2]] [[element]], on the [[Periodic Table]], with 38 [[proton]]s in the [[Atomic Nucleus|nucleus]].
: The most [[Stable Isotope|stable isotope]] of [[Strontium]] has 50 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 88.
: An [[atom]] of [[Strontium]] has only 2 [[electron]]s in its [[Outer Shell|outer shell]].
: [[Strontium]] [[ion]]s have lost two [[electron]]s to become [[Positive ChargedCharge|positively charged]].
====Properties====
: [[Strontium]] is a more [[Reactivity|reactive]] [[Alkali Earth Metal|alkali earth metal]] than [[Calcium]] but less [[Reactivity|reactive]] than [[Barium]].