1.

An element E loses one `alpha` and `beta`-particles in three successive stages. The resulting element will beA. an isobar of EB. an isotone of EC. an isotope of ED. E itself

Answer» Correct Answer - C
`._(Z)^(A)Eoverset(-alpha)rarr _(Z-2)^(A-4)X overset(-beta)rarr _(Z-1)^(A-4)Y overset(-beta)rarr_(" "Z)^(A-4)W`
Both elements E and W have same atomic number but different mass numbers. Hence, both are isotopes. So, the resulting element will be an isotope of E.


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