Where is most of the mass of an atom located?

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Multiple Choice

Where is most of the mass of an atom located?

Explanation:
Most of the atom’s mass is concentrated in the nucleus. The nucleus contains protons and neutrons, which each have about the same mass, while electrons are far lighter—roughly 1/1836 of a proton’s mass. This means the nucleus holds nearly all the atom’s mass, even though it occupies only a tiny fraction of the atom’s volume. The electron cloud (where the electrons reside) accounts for most of the atom’s size but contributes very little to its mass.

Most of the atom’s mass is concentrated in the nucleus. The nucleus contains protons and neutrons, which each have about the same mass, while electrons are far lighter—roughly 1/1836 of a proton’s mass. This means the nucleus holds nearly all the atom’s mass, even though it occupies only a tiny fraction of the atom’s volume. The electron cloud (where the electrons reside) accounts for most of the atom’s size but contributes very little to its mass.

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