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Question

90Th, a member of III group of Mendeleev's periodic table on losing α-particles forms a new element belonging to:

A
I group
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B
III group
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C
II group
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D
IV group
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Solution

The correct option is D II group
90Th a member of III group of Mendeleev's periodic table on losing α-particles forms a new element belonging to II group.

23290Th22888Ra+42He

Elements 89 to 103 are placed in III group.

Hence, option C is correct.

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