ln which oxidation state, group 15 elements act as Lewis base?

Amines act as Lewis bases.

Oxidation state of zero group elements is

On moving down the group , stability of +5 oxidation state of group - 15 elements decrease while that of +3 state increase - why ?

What are common oxidation states of group 15 elements?

What are common oxidation states of group 15 elements?

The hydribes of group 15 elements act as :

The hydribes of group 15 elements act as :