KCET · Chemistry · Structure of Atom
Which one of the following sets of ions represents the collection of isoelectronic species?
- A \(\mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Mg}^{2+}, \mathrm{Sc}^{3+}\)
- B \(\mathrm{Na}^{+}, \mathrm{Ca}^{2+}, \mathrm{Sc}^{3+}, \mathrm{F}^{-}\)
- C \(\mathrm{K}^{+}, \mathrm{Ca}^{2+}, \mathrm{Sc}^{3+}, \mathrm{Cl}^{-}\)
- D \(\mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{Al}^{3+}, \mathrm{Cl}^{-}\)
Answer & Solution
Correct Answer
(C) \(\mathrm{K}^{+}, \mathrm{Ca}^{2+}, \mathrm{Sc}^{3+}, \mathrm{Cl}^{-}\)
Step-by-step Solution
Detailed explanation
The number of electrons in these species are
\(\therefore \mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{Al}^{3+}\) and \(\mathrm{F}^{-}\)are isoelectronic species and each one of which has 10. Also, \(\mathrm{K}^{+}, \mathrm{Ca}^{2+}, \mathrm{SC}^{3+}\) and \(\mathrm{Cl}^{-}\)are electronic species and each one of which has 18 electrons.
\(\therefore \mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{Al}^{3+}\) and \(\mathrm{F}^{-}\)are isoelectronic species and each one of which has 10. Also, \(\mathrm{K}^{+}, \mathrm{Ca}^{2+}, \mathrm{SC}^{3+}\) and \(\mathrm{Cl}^{-}\)are electronic species and each one of which has 18 electrons.
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