Question

Which of the following compounds has pseudo inert gas configuration?

• A. ${\mathrm{K}}^{+}$
• B. ${\mathrm{S}}^{2-}$
• C. ${\mathrm{Cu}}^{+}$
• D. ${\mathrm{Na}}^{+}$

Answer 1

The correct option is C

${\mathrm{Cu}}^{+}$

Explanation for the correct option:

(c ) ${\mathrm{Cu}}^{+}$

• ${\mathrm{Cu}}^{+}–1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}$
• it has pseudo inert gas configuration.
• Hence this option is correct

Explanation for the incorrect options:

(a) ${\mathrm{K}}^{+}$

• ${\mathrm{K}}^{+}–1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^6$
• It has inert gas configuration.
• Thus, this option is incorrect.

(b) ${\mathrm{S}}^{2-}$

• ${\mathrm{S}}^{2-}–1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^6$
• It has inert gas configuration.
• Thus, this option is incorrect.

(d) ${\mathrm{Na}}^{+}$

• ${\mathrm{Na}}^{+}–1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• It has inert gas configuration.
• Thus, this option is incorrect.

Hence the correct option is (c ) ${\mathrm{Cu}}^{+}$