1.

Explain the formation ofthe compound formed by two elements withZ=20andZ=17 .

Answer»

Solution :`{:("Element","ATOMIC number","Electronic configuration"),(""Ca,""20,""2_(,)8_(,)8_(,)2),(""Cl,""17,""2_(,)8_(,)7):}`
Ca loses TWO electrons to attain octet while Cl gains an electron to attain octet. Hence , the FORMULA of the compound is
`Ca^(+2)Cl^(-1)`
`CaCl_(2)`


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