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Fill in the blanks:
$1.$ The size of $M^{3+}$ ions in the actinoid series ........... with an increase in atomic number.
$2.$ The common oxidation state of elements in the actinoid series is .......... .
$3.$ The appearance of elements in the actinoid series is like .......... .

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The lanthanoid that does $NOT$ show $+4$ oxidation state is

Describe the general chemical reactions of lanthanoids with the help of a diagram and state their uses.

The lanthanide contraction is responsible for the fact that

Which electronic configuration is common to all actinoid elements?

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