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An element ‘X’ (atomic number 17) reacts with an element Y (at. no. 20) to form a divalent halide. 

i. Give the formula of the compound. 

ii. Classify X and Y as metal, non-metal or metalloid. 

iii. What will be the formula of oxide of element Y?

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i. X has atomic number 17 i.e. Cl and its electronic configuration is (2,8,7). Thus, its valency is 1. Y has atomic number 20 i.e. Ca and its electronic configuration is (2,8,8,2). Thus, its valency is 2. 

∴ The compound will be YX2 i.e. CaCl2 

ii. X accepts electron, therefore, it is a nonmetal; Y donates electrons, so it is a metal. 

iii. Y has valency 2 and oxygen also has valency 2. 

∴ Formula of oxide of Y is YO i.e. CaO.

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