Question

In which of the following compound the cation has pseudo inert gas configuration?
(1) NaCl (2) AlCl3 (3) CuCl (4) CaCl2

Answer 1

in CuCl the cation has pseudo inert gas configuration.

so, 3)CuCl

Answer 2

The correct option is 3.

• The species which has 18 electrons in its outermost shell possess pseudo inert gas configuration.
• In NaCl, sodium ions exist as $Na^+$. The electronic configuration of $Na^+$ is
• ${1s}^{2} {2s}^{2} {2p}^{6}$
• So, it contains 8 electrons in the outermost shell and does not contain pseudo inert gas configuration.
• In aluminium trichloride, aluminium ions exist as $Al^{+3}$. The electronic configuration of $Al^{+3}$ is
• ${1s}^{2} {2s}^{2} {2p}^{6}$
• So, it contains 8 electrons in the outermost shell and does not contain pseudo inert gas configuration.
• In CuCl, Cu ions exist as $Cu^{+}$. The electronic configuration of $Cu^{+}$ is
• ${1s}^{2} {2s}^{2} {2p}^{6} 3s^2 3p^6 3d^{10}$
• So, it contains 18 electrons in the outermost shell and contains the pseudo inert gas configuration.
• In calcium chloride, Ca ions exist as $Ca^{+2}$. The electronic configuration of $Ca^{+2}$ is
• ${1s}^{2} {2s}^{2} {2p}^{6} 3s^2 3p^6$
• So, it contains 8 electrons in the outermost shell and does not have a pseudo inert gas configuration.