Question

which of these can always exist alone in nature
a)atoms of all elements b) molecules of all element or compounds
c)ions  d)all of these

Answer 1

Ions can exist alone, but they are unstable around oppositely charged ions, meaning they have a strong attraction when close and will quickly fall into each other.

Answer 2

Ions can always exist alone in nature because we can easily seperate them by electrolysis.