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==Key Stage 3==
===Meaning===
[[File:BariumSymbolBariumSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Barium]].]]
[[Barium]] is a [[Group 2]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 56.
===About Barium===
==Key Stage 4==
[[File:BaKS4.PNG|right|200px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Barium]].]]
===Meaning===
[[Barium]] is a [[Group 2]] [[element]], on the [[Periodic Table]], with 56 [[proton]]s in the [[Atomic Nucleus|nucleus]].
: The most [[Stable Isotope|stable isotope]] of [[Barium]] has 81 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 137.
: An [[atom]] of [[Barium]] has only 2 [[electron]]s in its [[Outer Shell|outer shell]].
: [[Barium]] [[ion]]s have lost two [[electron]]s to become [[Positive ChargedCharge|positively charged]].
====Properties====
: [[Barium]] is a more [[Reactivity|reactive]] [[Alkali Earth Metal|alkali earth metal]] than [[Strontium]] but less [[Reactivity|reactive]] than [[Radium]].