Which of the following has highest number of unpaired electrons?

Question

Which of the following has highest number of unpaired electrons? (A) Fe (B) Fe2+ (C) Fe3+ (D) All have equal number of unpaired electrons

Tardigrade Admin · Accepted Answer

Fe(26) = 1s2 2s22p63s23p63d64s2 Hence, it has 4 unpaired electrons. Fe2+ = 1s22s22p63s23p63d64so ∴ It also has 4 unpaired electrons. Fe^{3+ = 1s^{2 2s^{22p^{6 s^{23p^{63d54s^o}}}}}}

Q. Which of the following has highest number of unpaired electrons?

Fe

Fe²⁺

Fe³⁺

All have equal number of unpaired electrons