Question

Which of the following mostly accounts for the mass of an atom?
Neutrons
Neutron and Proton
Electron and Proton
Electron and Neutron​

Answer 1

Neutron and proton

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Answer 2

Answer: This may help you

Explanation:

The mostly accounts for the mass of an atom are protons and neutrons.

The protons and neutrons of the nucleus account for nearly all of the total mass of atoms, with the electrons and nuclear binding energy making minor contributions. Thus, the numeric value of the atomic mass when expressed in daltons has nearly the same value as the mass number.