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The sum of all Protons and Neutrons.

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Bradly Buckridge

Lvl 10
3y ago
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Wiki User

7y ago

Nearly all of an atom and mass is made up of protons and neutrons.

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Wiki User

8y ago

The sum of all Protons and Neutrons.

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Wiki User

7y ago

The nucleolus.

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7y ago

These are protons and neutrons.

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Emaree Robinson

Lvl 3
3y ago

The sum of all protons and neutrons -Apex

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Q: What makes up nearly all of the atom's mass?
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