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प्रश्न
The element X has an atomic mass number of 238 and an atomic number
of 92. It emits an alpha particle forming an element y. Y can be represented
by
पर्याय
234 x 90
236 x 90
235 x 91
238 x 92
238 x 934
उत्तर
Initially element is represented by 92x238
a particle is represented by 2He4 this means it contains 2 protons and 2
neutrons so mass of a particle is 4 unit. Thus after emitting a particle mass
number of element would decrease by 4 unit and atomic number of element would decrease by 2.
So after emitting a particle 92x238 would become 92 - 2 x 23a-4 = 90 x 234 .
bQa = 93p239
So answer is A.
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