Question

Write the increasing order of energies of 4s,3p,4p and 3d.

Answer 1

For 4s,n=4,l=0,(n+l)=4
For 3p,n=3,l=1,(n+l)=4
For 4p,n=4,l=1,(n+l)=5
For 3d,n=3,l=2,(n+l)=5
`rArr 3plt4slt3dlt4p` increasing order