An element ' $\mathrm{X}$ ' is forming an acidic oxide. Its position in modern periodic table will be
(a) Group 1 and Period 3
(b) Group 2 and Period 3
(c) Group 13 and Period 3
(d) Group 16 and Period 3
OR
Consider the following statements about an element ' $\mathit{X}$ ' with number of protons 13 .
(A) It forms amphoteric oxide
(B) Its valency is three
(C) The formula of its chloride is ${\mathrm{XC}}_3$
The correct statements (s) is/are