Question

An element z forms an oxide zo3 (i)what is the valencies of element z?(ii)what will the formula of fluride of z?

Answer 1

The valency of O is 2.
The valency of z will be 6

Answer 2

Answer: The valency of the element Z is 6. The formula of the fluoride of Z is $ZF_6$

Explanation: The ionic compounds are formed by the combination of positively charged cations and negatively charged anions. The ionic compound formed must be neutral so the positive and negative charges are balanced.

Oxide ion is a ion with 2- charge, and as the formula of oxide is $ZO_3$ , the valency of the ions must be 6 which when represented in simple whole number ratio is 1:3.

The fluoride is a ion with 1- charge and as valency of the element is +6. Thus the formula of its netral fluoride is $ZF_6$