The correct order of size is

P r^{3 +} > D y^{3 +} > E u^{3 +} > T m^{3 +}

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E u^{3 +} > P r^{3 +} > D y^{3 +} > T m^{3 +}

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P r^{3 +} > T m^{3 +} > E u^{3 +} > D y^{3 +}

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P r^{3 +} > E u^{3 +} > D y^{3 +} > T m^{3 +}

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Solution

The correct option is D $P r^{3 +} > E u^{3 +} > D y^{3 +} > T m^{3 +}$
Size of $L n^{3 +}$ decreases with increasing atomic number.

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