Answer: Neon is not reactive (full valence shell)
Explanation:
Neon is a noble gas and has a stable structure (8 valence electrons) -therefore, is not very reactive.
Answer:
See below
Explanation:
Ammonium 
is not a molecular ion because it is just a poly-atomic ion. A molecular ion has a "negative or positive charge" as a whole but the positive charge on here is not on the whole. So, it is a poly-atomic ion and not molecular ion.
expect what to have?!?!?!?
I would say A but then again im not too sure so hope that makes it easier to somehow
