Which subatomic particle has no charge and contributes to atomic mass?

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Multiple Choice

Which subatomic particle has no charge and contributes to atomic mass?

Explanation:
Neutrons are uncharged particles that sit in the nucleus with protons. They add mass to the atom without changing its charge, which is why they are the component that contributes to atomic mass while being electrically neutral. Electrons do have charge (negative) and, despite being part of the atom, their mass is so small compared with protons and neutrons that they don’t meaningfully affect the atomic mass. Protons do have mass and positive charge, and quarks are smaller building blocks inside protons and neutrons rather than separate atomic particles that contribute to mass on their own in this context.

Neutrons are uncharged particles that sit in the nucleus with protons. They add mass to the atom without changing its charge, which is why they are the component that contributes to atomic mass while being electrically neutral. Electrons do have charge (negative) and, despite being part of the atom, their mass is so small compared with protons and neutrons that they don’t meaningfully affect the atomic mass. Protons do have mass and positive charge, and quarks are smaller building blocks inside protons and neutrons rather than separate atomic particles that contribute to mass on their own in this context.

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