Question

Which one of the following sets of ions represents a collection of isoelectronic species?
(Given : Atomic Number : $F = 9, Cl = 17, Na =11, Mg =12, Al =13, K =19, Ca =20, Sc =21$ )

• A. $N ^{3-}, O ^{2-}, F ^{-}, S ^{2-}$
• B. $Li ^{+}, Na ^{+}, Mg { }^{2+}, Ca ^{2+}$
• C. $Ba ^{2+}, Sr ^{2+}, K ^{+}, Ca ^{2+}$
• D. $K ^{+}, Cl ^{-}, Ca ^{2+}, Sc ^{3+}$

Answer 1

Answer: (D)

Correct answer is (d) $K ^{+}, Cl ^{-}, Ca ^{2+}, Sc ^{3+}$