Among the second period which group element form most acidic oxide.

Q. The position of element $RaC$ in the periodic table is:
${}_{88}^{226}Ra{\stackrel{-\alpha }{\to }}_{86}Rn\stackrel{-\alpha }{\to }RaA\stackrel{-\beta }{\to }RaB\stackrel{-\alpha }{\to }RaC$

Q. An element X forms an oxide X₂O₃. In which group of Mendeleev's periodic table is this element placed?

(a) group II
(b) group III
(c) group V
(d) group VIII

Q. Which is most abundant element in $17th$ group?

Q.

Question 17

Elements of which of the following group (s) of periodic table do not form hydrides?

(a) Groups 7,8,9 (b) Group 13

(c) Groups 15,16,17 (d) Group 14

Q. An element R forms the highest oxide $R_2{O}_5$. The element R belongs to: