Power Plant Engineering
The mass number of a substance represents the sum of total number of

Neutrons and electrons in an atom
Protons and neutrons in an atom
Protons and electrons in an atom
Protons and neutrons in a nucleus

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Power Plant Engineering
Isotopes of same elements have

Different chemical properties and same atomic numbers
Same atomic number and different masses
Different masses and different atomic numbers
Same chemical properties but different atomic numbers

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