Which of the following cations has the same number of unpaired electrons as Fe²⁺? A) Ni²⁺ B) Fe³⁺ C) Cr²⁺ D) Mn²⁺ E) Co²⁺

Question

Quizplus · Accepted Answer

Fe²⁺ has 4 unpaired electrons (one from Fe and three from S), so we need to find a cation with the same number of unpaired electrons. Ni²⁺ has 2 unpaired electrons (one from Ni and one from S). Fe³⁺ has 5 unpaired electrons (one from Fe and four from S). Cr²⁺ has 4 unpaired electrons (one from Cr and three from S), which matches Fe²⁺. Mn²⁺ has 3 unpaired electrons (one from Mn and two from S). Co²⁺ has 3 unpaired electrons (one from Co and two from S). Therefore, the best choice is C, Cr²⁺.

Which of the Following Cations Has the Same Number of Unpaired