Question

Are all elements except for the noble gases a diatomic molecule

Answer 1

✨No, all elements except for the Noble gases a diatomic molecules. Eg: Carbon (C), Lithium (Li), Sodium (Na), etc.
Hope it helps.✨

Answer 2

No,

Na is not diatomic

Na2 does not exist.

Metals are not diatomic ( S block and some of p block)

Many d and f block elements like uranium , copper are not diatomic