Question

Consider following radioactive decay of
$I{:}_{92}U\stackrel{-a}{\to }{}_{90}Th$
$II{:}_{90}U\stackrel{-a}{\to }{}_{88}Ra$
In which case group of the parent and daughter element remain uncharged ?

• A. in I
• B. in II
• C. in both (a) and (b)
• D. in none of these

Answer 1

The correct option is A in I

In I both U and Th belongs to IIIB group.