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If $M$ is element of actinoids series, the degree of complex formation decreases in the order
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$\mathrm{M}^{4+} \gt \mathrm{MO}_2^{2+} \gt \mathrm{M}^{3+} \gt \mathrm{MO}_2^{+}$
The higher the charge on the metal ion, smaller is the ionic size and more is the complex forming ability. Thus, the degree of complex formation decreases in the order
$\mathrm{M}^{4+} \gt \mathrm{MO}_2^{2+} \gt \mathrm{M}^{3+} \gt \mathrm{MO}_2^{+}$
The higher tendency of complex formation of $\mathrm{MO}_2^{2+}$ as compared to $\mathrm{M}^{3+}$ is due to high concentration of charge on metal atom M.
$\mathrm{M}^{4+} \gt \mathrm{MO}_2^{2+} \gt \mathrm{M}^{3+} \gt \mathrm{MO}_2^{+}$
The higher tendency of complex formation of $\mathrm{MO}_2^{2+}$ as compared to $\mathrm{M}^{3+}$ is due to high concentration of charge on metal atom M.
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