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Among the following which one is not paramagnetic? [Atomic numbers: Be = 4, Ne = 10, As = 33, Cl = 17]

1. Cl−
2. Be+
3. Ne+2
4. As+

Correct answer: Cl−

Solution

Cl− is not paramagnetic because it has a completely filled electronic configuration, resulting in no unpaired electrons. The other species have unpaired electrons, making them paramagnetic.

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