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The particles in the atom that account for most of the mass of the atom are protons and
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The particles in the atom that account for most of the mass of the atom are protons and

User Johhny B
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Answer:

Neutrons

Step-by-step explanation:

There are three particles that make up an atom, proton, neutron and electron. The mass of protons and neutrons is considered to be equal though in reality neutrons are heavier than protons; the mass of electrons is very less and ignored in the calculation of atomic mass.

User Florian Doyon
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