1.

While coming back from school in the school in the school bus , Bill asked his friend Gill to predict the atoms, X andY while form a stable dinegative ion and a uninegative ion respectively . Theyhave same number of electrons in the L shell which is the shell inner to the valence shell . predict the answer given by gill .

Answer»

Solution : `{:(,X^(-2),Y^(-1)),(E.C,2_(,)8_(,)8,2_(,)8_(,)8):}`
Electronic configuration of corresponding neutral atoms , X and Y are as FOLLOWS :
`Xto2, 8 , 6"" Yto2, 8 , 7`
Atomic numbersof X and Y are 16and 17 respectively and hence they are SULPHUR and chlorine


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