Tells the number of protons in an atom.

Tells the number of electrons in a neutral atom.

Tells the mass of the nucleus.

Protons in a potassium atom.

Protons in a barium atom.

Electrons in a neutral fluorine atom.

Electrons in a neutral gold atom.

Mass of a nitrogen atom.

Neutrons in a silicon atom.

Neutrons in a sodium atom.

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