A hypothetical 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 hypothetical ion of ………… `._(z)^(40)X^(2+)` `n = e +(23)/(100)e` & `n = 40 -z` or `n = 40- (e+2)` `40-(e+2)= e+(23)/(100)e` `40 = (123e)/(100)+e+2` `40-2= (223 e)/(100)` `e = 17, z = 19 or n = 21`
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