1.

Successive emission of an alpha - particle and two beta- particles by an atom of an element results in the formation of its :

Answer»

Isodiapher
ISOBAR
Isotope
Isotone

Solution :`""_(Z) X^(A1) overset(- alpha - 2 (beta))(to) ""_(Z) X^(A2) `, so isotope is FORMED


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