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

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

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Power Plant Engineering
In nuclear fission

The electrons of the element change
The original elements change into completely different elements
The molecules rearrange themselves to form other molecules
None of the listed here

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