Question

2p, 3s, 3d, 4s of these which one has highest energy?

Answer 1

It's 3d because for energy we follow n+l rule

for 2p= 2+1=3

3s=3+0=3

3d=3+2=5

4s=4+0=4

as l for s orbital=0

p=1

d=2

f=3