Explanation:
Magnetic moment is $\sqrt{\text{n(n+2)}}$ where n is no of unpaired electron so transition metals show paramagnetism due to unpaired electron.
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The radius of $La^{3+} ($atomic number of $La = 57)$ is $1.06A.$ Which one of the following given values will be closest to the radius of $Lu^{3+}$? $($atomic number of $Lu = 71)$