f A represents atomic mass and Z represents atomic number wh

f 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. A+ 1, Z + 1

B. A-1, Z-1

C. A+ 1, Z-1

D. A-1, Z + 1

Solution

Atomic number \'Z\' is defined as the number of protons present in the nucleus. The atomic mass \'A\' is defined as number of protons and neutrons present in the nucleus. In an atom, the number of protons and electrons may be the same but the neuttron number may differ. Due to this reason, an atom can have different isotopes. Therefore, when a proton is emitted from the nucleus, it is represented as A - 1, Z - 1. Thus, option B is correct.