^{M^2+ contains 10 electrons and 10 neutrons
(i) What is atomic number and mass number of the element M
(ii) Is it possible in an atom to have 13 protons and 13 neutrons .
(iii) Why helium gas is inert}

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Solution

A.atomic no.=12 mass number =24
B.yes it is possible .it will exist as X-1
C.it has filled its outermost shell and hence achieved stability

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