With which of the following electronic configuration of an a... | Chemistry | SolveeIt | Solveeit

Today, August 18

Question

With which of the following electronic configuration of an atom has the lowest ionisation enthalpy?

A

$1s^2 , 2s^2, 2p^5$

B

$1s^2,2s^2 2p^3$

C

$1s^2,2s^2 2p^6,3s^1$

D

$1s^2 , 2s^2 2p^6$

Answer

$1s^2,2s^2 2p^6,3s^1$

Explanation

Solution

The electronic configuration $1s^2,2s^2 2p^6,3s^1$ shows lowest ionisation energy because this configuration is unstable due to the presence of one electron in s-orbital. Hence, less energy is required to remove the electron.