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Q.

The first member of actinide series is

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a

actinium

b

cerium

c

thorium

d

uranium

answer is C.

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Detailed Solution

Although it doesn't have any 5f electrons in its metallic, gaseous, or ionic forms, actinium, element 89, is the first element in the actinide series according to this definition.

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The first member of actinide series is