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I need sum help on this

I need sum help on this-example-1
User Mosg
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Answer:

Protons and Neutrons

Step-by-step explanation:

Neutrons and protons constitute almost all of an atom's mass. The third type of stable particle is the electron. Electrons have a negative charge but are extremely small and have a mass only 1/1850 that of a proton or neutron. They are so small that for practical purposes they do not contribute to the mass of the atom.

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User AdPartage
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