The number of neutrons are equal to the numberof protons present in the nucleus of two elements and their respective dinegative ions possess 8 electrons in L and M shells respectively . Then the ratio of mass numbers of the two elements is

The number of neutrons are equal to the numberof protons present in th

1.	The number of neutrons are equal to the numberof protons present in the nucleus of two elements and their respective dinegative ions possess 8 electrons in L and M shells respectively . Then the ratio of mass numbers of the two elements is
Answer» `1 :2` ` 3:3` `3:4` `2:5` Solution :The ELECTRONIC CONFIGURATION of the dinegative ion with 8 ELECTRONS in VALENCE shell (L shell) is `X^(2)to2 , 8` `Xto2 , 6 (Z)` mass number is 16, `Y^(-2)to2 , 8 , 8` `YTO 2 , 8 , 6 (Z)` Mass number is 32 (A) for Y. Ratio ofmass number`16: 32, "" 1 : 2`