An element P has an atomic mass of 239 and an atomic number of 92. It emits a beta particle forming an element Q. Q can be represented by

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Initially element is represented by 92p239 $\beta$ particle is represented by -1e° after emitting a $\beta$ particle atomic number of element would increase by 1 unit and mass number of element would remain unchanged. So after emitting a $\beta$ particle 92p239 would become 92+1 p239 = 93p239. bQa = 93p239 So answer is C.

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