Physics
In the gamma decay of a nucleus

The mass number of the nucleus does not change whereas its atomic number changes
Neither the mass number nor the atomic number of the nucleus changes
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus changes whereas its atomic number does not change

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Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
the same number of protons but different number of neutrons
equal number of protons and electrons
equal number of nucleons

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