If A represents atomic mass and Z represents atomic number, which of the following describes an atom after a proton is emitted from its nucleus?
A-1,Z+1
A+1,Z-1
A-1,Z-1
A+1,Z+1
Correct Answer : C
When a proton is emitted from the nucleus of an atom, the atomic number (Z) decreases by 1 because a proton has a positive charge, and it's effectively removing one positive charge from the nucleus. However, the atomic mass (A) remains the same because protons and neutrons contribute to the atomic mass, and the emission of a proton does not affect the number of neutrons.
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