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Question

Number of unpaired electrons of neutral manganese atom and its divalent ion are in the ratio (the atomic number of manganese is 25 and it loses two electrons to form the divalent ion):
  1. 1:1
  2. 25:23
  3. 5:3
  4. 3:5

A
1:1
B
25:23
C
3:5
D
5:3
Solution
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Manganese atom has 5 electrons in 3d orbital and two electrons in 4s orbital.It has five unpaired electrons. In its +2 oxidation state, the two '4s' electrons are lost and it has five unpaired electrons.

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