Question

11.Write the designation for orbitals with following quantum numbers-

(a) n = 3, l = 1 (b) n = 5, l = 2​

Answer 1

The correct designation for orbitals with the following quantum numbers are given below.

(a) n=3, l=1

l=1 indicates electrons are present in subshell p.

n=3 indicates electrons are present in the 3p subshell.

Therefore the designated orbitals with n=3, l=1 is 3p.

• The p subshell has maximum of 3 orbital, so the total electron in that subshell will be six.

(b) n=5, l=2

l=2 indicates electrons are present in subshell d.

n=5 indicates electrons are present in the 5d subshell.

Therefore, the designated orbitals with n=5, l=2 is 5d.

• The d subshell has a maximum of 5 orbital, so the total electron in that subshell will be ten.

Answer 2

(a) given :

n= 3

l = 1

the n represents the principal quantum number

and  l is for angular momentum quantum number.

we have,  

n= 3 ; shell=3

l =1 ;subshell = p

m = +1 to -1

therefore electron will be present in 3p orbital.

 

(b)given :

n = 5 ; shell = 5

l = 2 ; subshell = d

m =+1 to -1

hence, electron is present in 5d orbital.