Which divalent metal ion has maximum paramagnetic character among the first series transition metals ?

Explanation

To determine which divalent metal ion has the maximum paramagnetic character among the first series of transition metals, we need to analyze the electronic configurations of these metals in their divalent state and count the number of unpaired electrons.

### Step-by-Step Solution:

1. **Understanding Paramagnetism**:
- Paramagnetic substances have unpaired electrons. The more unpaired electrons an atom or ion has, the stronger its paramagnetic character.

2. **Identifying the First Series Transition Metals**:
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