1.

Let us consider emission of alphaparticle from uranium nucleus: ._(92)^(235)U - ._(2)He^(4) to ._(90)Th^(231) {:(e = 92, e = 0, e = 90),(p = 92, p = 2, p = 90),(n = 143, n = 2, n = 141):} shortage of two electorns in thorium is due to:

Answer»

CONVERSION of electrons to positron
combination with positron to evolve energy
annihilation
absorption in the nucleus

Answer :B,C


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