Answer:
A molecule is stable when there is no energetically-accessible mechanism available that allows it to reacts and form a more stable molecule or molecules whiles Are configuration of unknown atomic nuclei and electrons discovered by Reed Richard
So, I don't know the answer for b but I think I found the answer for a.
I sincerely hope this isn't wrong
Helium would be the least I think
It is a <u>mixture</u> of minerals mainly of corps that crystalizes of magma below earths surface.
