Aqueous solution of which salt will not contain ions with the electronic configuration \(1s^2 2s^2 2p^6 3s^2 3p^6\) ?
Show Hint
- \(\mathrm{NaF}\)
- \(\mathrm{NaCl}\)
- \(\mathrm{KBr}\)
- \(\mathrm{CaI_2}\)
The Correct Option is A
Solution and Explanation
\(\mathrm{Na^+}\) has 10 electrons, \(\mathrm{F^-}\) has 10, \(\mathrm{Cl^-}\) has 18, \(\mathrm{K^+}\) has 18, \(\mathrm{Br^-}\) has 36, \(\mathrm{Ca^{2+}}\) has 18, \(\mathrm{I^-}\) has 54.
NaCl contains \(\mathrm{Cl^-}\) (18), KBr contains \(\mathrm{K^+}\) (18), and \(\mathrm{CaI_2}\) contains \(\mathrm{Ca^{2+}}\) (18). Only NaF has \(\mathrm{Na^+}\) and \(\mathrm{F^-}\), both neon-like (10 electrons), so no ion has the given configuration.
Answer: (1) \(\mathrm{NaF}\)
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