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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