Its nuclei are alpha particles.
An ion containing this element along with fluorine and oxygen has been predicted stable. In one experiment, the nuclei of this element were fired at a thin layer of gold atoms. Superfluidity has been observed in both its isotopes three and four. This element is the lightest with a full s subshell. Its nuclei are alpha particles. For 10 points, name this gas with atomic number two.
An ion containing this element along with fluorine and oxygen has been predicted stable.
{helium} [or {He}]