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Question
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
Options
239 x 91
239 x 92
239 x 93
238 x 92
235 x 90
Solution
Initially element is represented by 92p239
β particle is represented by -1e° after emitting a β particle atomic number of element would increase by 1 unit and mass number of element would remain unchanged.
So after emitting a β particle 92p239 would become 92+1 p239 = 93p239.
bQa = 93p239
So answer is C.
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