Question

Third transition series consists of

• A. atomic no. $39-48$ and having incomplete $4 d$ -orbitals.
• B. atomic no. $57,72$ to $80$ having incomplete $5 d$ -orbitals
• C. atomic no. $89,104$ to $112$ having incomplete $6 d$ -orbitals
• D. atomic no. $21$ to $30$ and having incomplete $3 d$ -orbitals.

Answer 1

Answer: (B)

Correct answer is (b) atomic no. $57,72$ to $80$ having incomplete $5 d$ -orbitals