Question

most of the mass of an atom is contained in​

Answer 1

Answer:

NUCLEUS

Explanation:

Most of an atom's mass is in the nucleus—a small, dense area at the center of every atom, composed of nucleons. Nucleons include protons and neutrons. All the positive charge of an atom is contained in the nucleus, and originates from the protons.

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Answer 2

Answer:

the nucleus contains most of the mass of an atom

Explanation: Because the nucleus of an atom consists of proton and neutrons