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: An [[atom]] of [[Beryllium]] has only 2 [[electron]]s in its [[Outer Shell|outer shell]].
: [[Beryllium]] [[ion]]s have lost two [[electron]]s to become [[Positive Charged|positively charged]].
{| class="wikitable"
|[[File:Beryllium.png|center|200px]]
|[[File:BerylliumSymbol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "2"|[[Beryllium]] always has 4 [[proton]]s. The most [[Stable Isotope|stable]] [[isotope]] has 5 [[neutron]]s.
|}