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Question

$$_{90}\textrm{Th}$$, a member of $$III$$ group of Mendeleev's periodic table on losing $$\alpha$$-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
$$_{90}\textrm{Th}$$ a member of $$III$$ group of Mendeleev's periodic table on losing $$\alpha$$-particles forms a new element belonging to $$II$$ group.

$$_{ \;\, 90}^{232}\textrm{Th}\longrightarrow _{ \,\,88}^{228}\!\textrm{Ra}+  _{2}^{4}\!  \textrm{He}$$

Elements 89 to 103 are placed in $$III$$ group.

Hence, option C is correct.

Chemistry
NCERT
Standard XII

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