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

Answer 1

Initially element is represented by ₉₂p²³⁹
β particle is represented by -1^e° 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.

_bQ^a = ₉₃p²³⁹
So answer is C.