Describe the structure and functions of the nucleus.
Explanation
The nucleus is the dense region at the center of an atom that contains protons and neutrons. The protons in the nucleus have a positive charge, while the neutrons are neutral. The number of protons in the nucleus determines the atomic number of an element, which in turn determines its chemical properties. The number of neutrons in the nucleus determines the isotope of an element, which can affect its physical properties.
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