Question

define quantum number write a note on principal quantum number​

Answer 1

Answer:

Explanation:

 Quantum  no's are introduced by marx planck.

           these are divided intofour types,

                 1 Principle quantum number: It is denoted by 'n'.

                                                                   and it describes about energy and    

                                                                    size of electron. 'n' has values 1,2,3....  and so on.