Question

Which orbital out of the following having a) max. energy b) minimum energy options are: 1) 2p 2) 3d
3) 5p
4)6s

Answer 1

According to $n+l$ rule the orbital with the least  $n+l$ value has the lowest energy.

$2p: n+l=2+1=3$
$3d: n+l=3+2=5$
$5p: n+l=5+1=6$
$6s: n+l=6+0=6$

So $2p$ has minimum energy as its $n+l$ value is lower than others.

$6s$ will have maximum energy eventhough $5p$ and $6s$ have same $n+l$ value because $6s$ has higher $n$ value.

Answer 2

answer is...............................
a)6s
b)2p