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Which emission causes the atomic number of a nuclide to decrease by 2 and its mass number to decreas

January 2020 NY Regents Chemistry Exam


48 Which emission causes the atomic number of a nuclide to decrease by 2 and its mass number to decrease by 4?

(1) an alpha particle

(2) a beta particle (3) gamma radiation

(4) a positron


Solution: The question is asking us which nuclear particle has an atomic number of 2 and mass number of 4. Looking at Table O on the Reference Table, we see that alpha particle has a mass number of 4 and an atomic number of 2.

Answer: 1


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