Question

Which has the highest number of unpaired electrons- Cr2+, Co2+, Fe2+ or Mn2+?​

Answer 1

you answer!!!!.........

Answer 2

Mn2+ is the correct answer.

Electronic configuration of chromium ions in +2 oxidation state is - 1s²2s²2p⁶3s²3p⁶3d⁴

Electronic configuration of cobalt ions in +2 oxidation state is - 1s²2s²2p⁶3s²3p⁶3d⁷

Electronic configuration of iron ions in +2 oxidation state is - 1s²2s²2p⁶3s²3p⁶3d⁶

Electronic configuration of manganese ions in +2 oxidation state is - 1s²2s²2p⁶3s²3p⁶3d⁵

As per the given electronic configurations, manganese ions have 5 unpaired electrons in d orbital. Chromium and iron ions has 4 unpaired electrons, cobalt ions has 3 unpaired electrons.

Thus, Mn2+ is the correct answer.