1.

The ratio of difference in the number of electrons between K and M shells is3 :2 for X and Y elements respectively . 'X' possesses stable electronic configuration and M is the valence shell for bothX and Y. The electronic configurations of X and Y are respectively.

Answer»

2 , 8 , 5 AND2 , 8 , 4
2 , 8 , 8 and 2 ,8 , 6
2 , 8 , 8and 2 , 6 , 6
2 , 8 , 6 and 2 , 8 , 4

Solution :`{:(X,:,Y),(2_(,)8_(,)8,,2_(,)8_(,)x),((8-2)/(x-2)=(3)/(2),,rArrx=6):}`
`:.Xto2,8,8and Yto2,8,6`


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