Question
Question: Which one of the transition metal ions is coloured in aqueous solution?...
Which one of the transition metal ions is coloured in aqueous solution?
A
Cu+
B
Zn2+
C
Sc3+
D
V4+
Answer
Sc3+
Explanation
Solution
(1) Valence shell electron configuration of V3+ is [Ar]18 3d2 ; so n = 2
(2) Valence shell electron configuration of Cr3+ is [Ar]18 3d3 ; so n = 3
(3) Valence shell electron configuration of Fe3+ is [Ar]18 3d5 ; so n = 5
(4) Valence shell electron configuration of Co3+ is [Ar]18 3d6 ; so n = 4