Question

What is the general electronic configuration for $2nd$ row transition series?

• A. $[N e] 3 d^{1-10}, 4 s^{2}$
• B. $[A r] 3 d^{1-10}, 4 s^{1-2}$
• C. $[K r] 4 d^{1-10}, 5 s^{1-2}$
• D. $[X e] 5 d^{1-10}, 5 s^{1-2}$

Answer 1

Answer: (C)

Transition elements have three series $3 d , 4 d$ and $5 d$. $3 d$ series has elements $21( Sc )$ to $30( Zn )$ atomic number. $4 d$ series has elements $39(Y)$ to $48(C d)$ atomic number. $[K r] 4 d^{1-10}, 5 s^{1-2}$ has $IInd$ row series.