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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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:
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.
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