Question

An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound. 

(a) XY₂

(b) XY

(c) X₂Y

(d) (XY)₂

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Answer 1

ANSWER

OPTION A XYgroup 2 and its valency is 2. Element Y is from group 17 and its valency is 1. So, one atom of X combines with two atoms of Y to give a compound of the formula XY2.

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Answer 2

Answer:

The chemical formula of the formed compound from element X and Y will be XY₂.

Therefore, the option (a) is correct.

Explanation:

• The element X of group 2 are alkaline earth metal having valence electronic configuration ns²np⁰. Therefore element X is electropositive in nature. They have tendency to loss the electron to get noble gas configuration. Therefore it forms an ion in +2 oxidation state such as X²⁺.
• The element Y of group 17 is halogen having electronic configuration  ns²np⁵. It is highly electronegative in nature. Element Y will accept one electron to complete its octet. It is  present as Y⁻.
• The valency of X is 2 and valency of Y is 1. Therefore, the ions X²⁺ and  Y⁻ form an ionic compound which is XY₂.