Question

1.) Principal Quantum Number

What values can this number have? What information does it provide in relation to an electron? (Be complete in your answer.)

Answer 1

(i) Principal quantum number (n):

It was proposed by Niel’s Bohr. It is represented by ‘n’. It indicates the orbit number. Principal quantum number (n) can also be designated by letters.

It determines the size and large extent of energy of the orbital.

The maximum number of electrons present in an orbit = 2n² where              n = number of the orbit.

                                                                

The shells are represented by the letter as

n =                  1          2          3          4          ……..

Shells =          K          L          M        N         ……..

Size of an orbit increases with the increase of principal quantum number. The energy of orbit also increases with increase of ‘n’ value.