Respuesta :

Answer:

An atom is the basic unit of a chemical element. Atoms are made out of three main parts: protons, neutrons and electrons. Protons and neutrons are contained inside the very center of the atom, which is called the nucleus.

Explanation:

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Answer:

an atom

Explanation:

an atom is a basic element of chemical reaction.

an atom made of three parts

1. neutrons

2. protons

3. electrons

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