Name the particles which determine the mass of an atom.
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Total number of protons and neutrons present in the nucleus of an atom determine its mass.
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From the symbol 2412Mg state the mass number, the atomic number and electronic configuration of magnesium.
If an atom has one proton and one electron, state the charge on the atom. Justify your answer.
An atom has 3 electrons in M shell. What is the atomic number of the element ?