So, in my opinon, both OH and NH4 ion dont stay in this form individually since it is no reason scientifically for this, this ion only forms when there is energy exerting on them when in combination with other element in ionic bonding...

Ammonium ion and hydroxide ion exist as pure ion when they are in solution which doesn't react with the compound and bare a moderate attractive forces to pull out the ion alone.

Like sodium ion and chloride ion are example when sodium chloride dissolves in aqueous solution, such as water.

 

Actually, formation and activity of molecule can be explained by quantum mechanics. So far, I haven't learnt that yet.

I was greedy and read a few page.

There was a sentence I always memorize is " the quantum mechanics is the study of the probability of chance of collision"

I think it may be useful now

Like sodium ion and chloride ion are example when sodium chloride dissolves in aqueous solution, such as water.

I forgot to tell you, in molten state , there are mobile ions too:P

Any way, I am not going to ask too many questions any more

 

but any way, as long as I know how to find what and how many charges there are, thats more than enough

 

A link to a simple and clear explanation : http://dl.clackamas.cc.or.us/ch104-07/polyatom1.htm

 

ALbert