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The number of neutrons are equal to the ...

The number of neutrons are equal to the number of 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

A

`1 : 2`

B

` 2 : 3`

C

`3 : 4`

D

` 2 : 5`

Text Solution

Verified by Experts

The correct Answer is:
1
The electronic configuration of the dinegative ion with 8 in electrons in L valence shell is : `X^(-2)to2,8`
`Xto2,6 `( Z) , mass number is 16 for X.
The electronic configuration of the dinegative ion with 8 electrons is M shell is
`Y^(-2)to2,8,8`
`Yto2,8,6 (Z)`
Mass number is 32 (A) for Y.
Ratio of mass number is `16 :32rArr1 :2`
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