Question

an element A is in the 13th group of periodic table. write the chemical formula of its oxide chloride and nitrate

Answer 1

An element is 13th group has 3 electrons in its valence shell and thus has a valency of 3.
It loses electrons to form cation with charge 3+.
Oxide has a charge of 2-., chloride and nitrate have a charge of 1-.

Formula of oxide of element X belonging to group 13 is X₂O₃
​chloride : XCl₃ and nitrate X(NO₃)_3
​