Which one of the following elements can exist in a mono-atomic molecular state?

Which one of the following elements can exist in a mono-atomic molecular state?

مندرجہ ذیل میں سے کون سا عناصر مونو-ایٹمک سالماتی حالت میں موجود ہوسکتا ہے؟
Explanation

Neon (Ne) is a noble gas.

It is exists as a monoatomic (single-atom) molecule under normal conditions.