Question

Which of the following set of elements belongs to the first transition series of the periodic table?

• A. V, Fe, Mn
• B. Ti, Co, Cu
• C. Ta, V, Cd
• D. Y, Hg, Cr

Answer 1

Answer: (A), (B)

Ti, Co, Cu

The first transition series or 3d series corresponding to the filling of 3d sublevel consists of the following 10 elements of the $4^{th}$ period: Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn. Hence Vanandium (V) belongs to first transition series.
Hence, option (a) and (b) are correct.