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attomic_structure

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= Structure of the Atom ====== The atom is the basic unit of matter and is composed of three types o... s. The number of protons in the nucleus is known as the atomic number, which determines the element o... ectrons it can hold. The outermost shell is known as the valence shell and determines the chemical beh... bol, which includes the element's atomic number, mass number, and charge. The mass number is the sum o