Question

Which of the following is the configuration of noble gas?

• A. $1s^{2}2s^{2}2p^{6}3s^2$
• B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^2$
• C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^6$
• D. $1s^{2}2s^{2}2p^5$

Answer 1

The correct option is C $1s^{2}2s^{2}2p^{6}3s^{2}3p^6$

The valence shell electronic configuration of noble gas is $n{s}^{2}n{p}^6.$
Only option c) ($1s^{2}2s^{2}2p^{6}3s^{2}3p^6$) has this electronic configuration.