Question

$5p,4d,5fand6p$ orbitals are arranged in the order of decreasing energy. The correct option is ?

• A. $5f>6p>5p>4d$
• B. $6p>5f>5p>4d$
• C. $6p>5f>4d>5p$
• D. $5f>6p>4d>5p$

Answer 1

The correct option is A $5f>6p>5p>4d$

$(n+l)$ values for,
$\text{n(Principal quantum number)}$
$\text{l (azimuthal quantum number)}$ values for ,
$\text{d orbital=2}$
$\text{f orbital=3}$
$\text{p orbital=1}$

$4d=4+2=6$

$5p=5+1=6$

5f = 5 + 3 = 8

$6p=6+1=7$

$\therefore$ Correct order of energy would be

$5f>6p>5p>4d$