Question

What's the difference between Fe²+ and Fe³+? And yeah I saw Cu+ and Cu²+ too, why there's two types of Formula?​

Answer 1

Answer:

it is called variable valency.when an element have 2 or more valancies than it is called variable valency.It occurs because the outer valence electrons and the the first shell electrons are loose u will study in 9th class if u r in icse