Question

$4d,5p,5f$ and $6p$ orbitals are arranged in the order of decreasing energy. The correct order 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 $5f>6p>5p>4d$

The (n + l) values are given below,
$4d$ = 4 + 2 = 6
$5p$ = 5 + 1 = 6
$5f$ = 5 + 3 = 8
$6p$ = 6 + 1 = 7
The correct order of energy would be:
5f > 6p > 5p > 4d