The nucleus of an atom consists of A. Protons and Neutrons B. Neutrons and Electrons C. Electrons only D. None of the above

The correct answer is: A. Protons and Neutrons.

Protons and neutrons are both subatomic particles that make up the nucleus of an atom. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The number of protons in the nucleus determines the chemical element of the atom. For example, all atoms with one proton in the nucleus are hydrogen atoms, all atoms with two protons in the nucleus are helium atoms, and so on. The number of neutrons in the nucleus can vary, and atoms with the same number of protons but different numbers of neutrons are called isotopes.

Electrons are much smaller than protons and neutrons, and they are not found in the nucleus. Instead, they orbit the nucleus in shells. The number of electrons in an atom’s outermost shell determines the atom’s chemical properties.

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