What is an atomic nucleus?
1-the outer part of an atom in which electrons move
2-the outer part of an atom in which neutrons move
3-the central part of an atom, composed of protons and neutrons
4-the central part of an atom, composed of protons and electrons
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3-The central part of an atom composed, of protons and neutrons.
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Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided. We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles such as quarks
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