Tick the correct statement on the aufbau principle?

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

5f is lower in energy than 7s

(n - 1 )d subs hell always has energy more than ns subshell

(n - 1)d subshell is always lower in energy than ns subshell

5d is lower in energy than 4f

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Energy of ‘(n–1)d’ subshell is slightly greater than ‘ns’ subshell, hence "ns" orbital is filled first then (n – 1) d orbitals.

As per n+l rule (n+1)d subshell should have higher energy than "ns" subshell.

Energy increases with increase in the value of $n + l$
nf subshell should have higher energy than (n+2)s subshell.

Watch 3-min video & get full concept clarity

JEE

NEET

Foundation JEE

Foundation NEET

CBSE