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
B
III group
C
II group
D
IV group

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.ChemistryNCERTStandard XII

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