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An atom's mass is located entirely in the nucleus. In the nucleus, there are protons and neutrons. Electrons are located outside of the nucleus, but because the mass of an electron is so insignificantly small, it's not counted when determining the total mass.

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13y ago
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11y ago

The protons, neutrons, and electrons make up the mass of an atom of an element.

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Q: What parts of an atom make up the atom's atomic mass?
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How many atoms in PVC?

We make atomic number by number of protons in a atom. PVC is not single atom. We cant give it a atomic number.


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