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A hypothetical ion of element X with mas...

A hypothetical ion of element `X` with mass number 40, posses 2 units of positive charge and `23%` more neutrons than electrons. Symbol of the ion is :

A

`._(20)^(40)X^(+2)`

B

`._(19)^(40)X^(+2)`

C

`._(18)^(40)X^(+2)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
A hydrothetical ion of ………
`._(z)^(40)X^(2+)`
`n=e+(23)/(100)e` , & `n = 40 -z`
or `n=40-(e+2)`
or `n=40-(e+2)`
`40-(e+2)=e+(23)/(100)e`
`40 = (123 e)/(100)+e+2`
`40-2 = (223 e)/(100)`
`e=17` , `z=19` , or `n=21`
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