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

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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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