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attomic_structure

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tom ====== The atom is the basic unit of matter and is composed of three types of subatomic particles: protons, neutrons, and electrons. Protons are positively charged partic... The outermost shell is known as the valence shell and determines the chemical behavior of the atom. Th... ncludes the element's atomic number, mass number, and charge. The mass number is the sum of the number