Physics
If Z is the atomic number and A is the mass number of an atom, then which of the following relations is incorrect ?
- Number of electrons = Z
- Number of protons = A - Z
- Number of neutrons = A - Z
- Number of neutrons + number of protons = A
Radioactivity
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Answer
Number of protons = A - Z
Reason — The number of protons in an atom is equal to its atomic number (Z), not the difference between the mass number (A) and the atomic number (Z).
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