MCQEasy1 mark
1
Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)
A radioactive nucleus containing 128 nucleons emits a β – particle. After β – emission the number of nucleons present in the nucleus will be : (a) 128 (b) 129 (c) 124 (d) 127
Topic: Beta emission and mass number
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Answer
Exam answer
(a) 128.
Explanation
Beta emission changes atomic number but not mass number; the number of nucleons remains unchanged.
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