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What are the 2 basic parts of an atom?

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An atom is composed of two regions: the nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.
User Joseph Dunn
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Answer:

nucleus and electrons

Step-by-step explanation:

nucleus contains protons and neutrons

User Lubos Hasko
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