an element x(atomic no.17) reacts with element y (atomic no.20) to form a divalent halide. draw electron dot structure of the divalent halide.

Element X atomic number 17 is chlorine having electronic configuration 2,8,7(belongs to group 17).Thus it needs only one e- to complete its octet.Now another element Y atomic number 20.Thus configuration will be 2,8,8,2(group 2 element).It gives its two electrons to two chlorine atoms and acquire noble gas configuration and forms Ca²⁺ ion while Chlorine becomes 2Cl^-.The electron dot structure for this divalent halide will be as follows--

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