(D) $(d)$ The trivalent ion having the largest size in the lanthanide series is $La^{3+}$.As we move from $La^{3+}$ to $Lu^{3+}$, the ionic radius dec

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(D) $(d)$ The trivalent ion having the largest size in the lanthanide series is $La^{3+}$.As we move from $La^{3+}$ to $Lu^{3+}$, the ionic radius decreases due to lanthanide contraction, which is the steady decrease in the size of lanthanide ions with an increase in atomic number.