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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 |
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Answer» Correct Answer - 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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