Which have maximum paramagnetism in `M^(3+)` ion for Lanthanoid (spin only) ?

Explanation

To determine which lanthanoid ion, \( M^{3+} \), has the maximum paramagnetism based on the spin-only magnetic moment, we will follow these steps:

### Step 1: Understand the Concept of Paramagnetism
Paramagnetism is a property of materials that have unpaired electrons. The more unpaired electrons an ion has, the more paramagnetic it is. The magnetic moment can be calculated using the formula:
\[ \mu = \sqrt{n(n + 2)} \text{ Bohr magneton} \]
where \( n \) is the number of unpaired electrons.
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