Can there be such a thing as 1He?

Are you referring to Helium? Hmmm, is that a trick question? For while the symbol for Helium is He, the atomic number for Helium is 2 . . . unless Richard is correct and you are referring to a single Helium Atom . . . =P

me think you refer to gender by "1He", because this is gs section :)

1He, what can that be . . . a "he" is refering to another person who is male. yes, there can be 1 other male person, a "he" but it appears misandric to me to call a man a thing, if you didnt accidently post your Q in gs while intending to post in physics section.

if you mean a single Helium atom yes