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

Explanation

`{:(,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 numbers of X and Y are 16 and 17 respectively and hence they are sulphur and chlorine