: [[Argon]] is a [[gas]] at [[STP|standard temperature and pressure]].
: An [[atom]] of [[Argon]] has a full [[Outer Shell|outer shell]] of 8 [[electron]]s so it is [[inert]].
{| class="wikitable"
|[[File:Argon.png|center|200px]]
|[[File:ArgonSymbol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "2"|[[Argon]] always has 18 [[proton]]s. The most [[Stable Isotope|stable]] [[isotope]] has 22 [[neutron]]s.
|}