Question

Which of the following sets contain only isoelectronic ions?
(A) Zn2+, Ca2+, Ga3+ , Al3+ (B) K+, Ca2+, Sc3+, Cl–
(C) P3–, S2–, Cl–, Zn+2 (D) Ti4+, Ar, Cr3+, V5+

Answer 1

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The Answer is (b, c)

(a) Zn2+ (30 – 2 = 28), Ca2+ (20 – 2 = 18), Ga3+ (31-3= 28), Al3+ (13 – 3 = 10) are not isoelectronic.

(b) K+ (19 – 1 = 18), Ca2+ (20 – 2 = 18), Sc3+ (21 – 3 = 18), Cl– (17 + 1 = 18) are isoelectronic.

(c) P3- (15 + 3 = 18), S2- (16 + 2 = 18), Cl– (17 + 1 = 18), K+ (19 – 1 = 18) are isoelectronic.

(d) Ti4+ (22 – 4 = 18), Ar (18), Cr3+ (24 – 3 = 21), V5+ (23 – 5 = 18) are not isoelectronic.