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A neutral atom has a nucleus with a nuclear charge 13 times and mass 27 times that of hydrogen nucleus. How many electrons would be present in the stable positively charged ion?

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answer is D.

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Detailed Solution

if the element has electrons thirteen times more means its atomic number is 13, hence it is aluminium atom, its tripositive ion means Al^{+ 3} therefore on loosing 3e it will now will have 10

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