Question

an element X forms an oxide X203 in which group of mendeleevs periodic table in this element placed

Answer 1

in the 3rd group of mendeleevs periodic table

Answer 2

your element x 23 belongs to 3rd group of Mentalist periodic table as you clearly know that the valency of Oxygen is 2 and the valency of element X will be three so the store geometry suggests that x 23 should belong to group 3 ofmendeeleevs periodic table