Consider the following radioactive decays
I. ${}_{92}U {\overset{- α}{⟶}}_{90} Th$ and
II. $_{90} Th \overset{- α}{⟶} {}_{88}{Ra}$
In which case group of parent and daughter elements remains unchanged.

Question

Consider the following radioactive decays I. U 92 ⟶ - α 90 Th and II. 90 Th ⟶ - α Ra 88 In which case group of parent and daughter elements remains unchanged.

TestHub · Accepted Answer

For the following radioactive decays

I. ${}_{92}U {\overset{- α}{⟶}}_{90} Th$ and
II. ${}_{90}{Th} {\overset{- α}{⟶}}_{88} Ra$

In both Uranium and Thorium belongs to IIIB group.

$∵$ Elements with atomic number $90$ to $103$ belongs to same group, i.e. $III - B$ $3 rd$ group (i.e. actinoids).

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