There is a gradual decrease in size of atoms or $M^{+ 3}$ ions across the actinide series

True

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False

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Solution

The correct option is A True
Ionic size gradually decreases from $A c^{+ 3}$ to $L r^{+ 3}$ , this is called actinide contraction, which is a result of poor or ineffective shielding by 5f electrons. These electrons do not screen the outermost valence electrons which experience a greater electrostatic attraction from the positively charged nucleus.

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