Question

process of formation of Ions from molecules which are not in ionic state

Answer 1

Mono - atomic ions are formed by gain or loss of electrons to the valence shell in the atom or molecule.

This process is called ionization.

It can occur by radiation or transfer of electrons between molecules or atoms.

Compounds containing ions and held by ionic bonds are known as Ionic compounds.

Answer 2

Ion is created by when a certain chemical or physical reaction that takes place. Thus, it is formed by an electron gains or looses one or more electron.
There may be a formation of positive ion know as a cation. This usually occurs when a atom looses its electrons. 
Or negative formation of ions can also take place when an atom gains one or more electron. 
Ions that are formed from molecules that gain or lose some electrons are called poly atomic ions.