Atomic Structure Question 360

Question: Aufbau principle is obeyed in which of the following electronic configurations [AFMC 1999]

Options:

A) $ 1s^{2}2s^{2}2p^{6} $

B) $ 1s^{2}3p^{3}3s^{2} $

C) $ 1s^{2}3s^{2}3p^{6} $

D) $ 1s^{2}2s^{2}3s^{2} $

Show Answer

Answer:

Correct Answer: A

Solution:

According to Aufbau principle electron are filling increasing order of energy. Therefore the electronic configuration $ 1s^{2},2s^{2},2p^{6} $ obeys Aufbau principle.



NCERT Chapter Video Solution

Dual Pane