JEE Main 2025 Chemistry question
Lanthanoid ions with 4f⁷ configuration are : (A) Eu2+ (B) Gd3+ (C) Eu3+ (D) Tb3+ (E) Sm2+ Choose the correct answer from the options given below :
Answer: (1)
Solution
Eu2+: [Xe]4f⁷; Gd3+: [Xe]4f⁷. Both have 4f⁷ configuration.