Question

What is principle quantum no.

Answer 1

principle quantum no. [n]has been given to explain the line spectrum of elements. it also tells about distance of electron from the nucleus . also, tell about the energy of e- in h atom and h-like particles . it also tells about the maximum no. of e- which can be occupied in a  particular shell . it also tells the size of orbit about which e- belongs 
n=1,2,3,4....