Question

Which are similarly in between the elements of halogen group ?

Answer 1

The halogens all have the property that they have 7 electrons in their outer shell.

For quantum mechanical reasons, there is ‘room’ for 8 electrons in the outer shell. So the halogens will react rather strongly with elements that have one or two electrons in their outer shell. These electrons are loosely held by their nucleus because they are far from it, relatively speaking.

A good example is table salt, sodium chloride. Sodium has one electron in its outer shell, and chlorine, a halogen, would very much like that electron. So that electron moves over to the