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atomic structure
Atomic structure describes how an atom's subatomic particles are arranged: protons and neutrons form a dense, central nucleus, while electrons orbit it in shells or energy levels. The number of protons, known as the atomic number, defines the element and is equal to the number of electrons in a neutral atom. The mass number is the combined total of protons and neutrons, and the overall arrangement determines the atom's chemical properties
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Nothing new in this, Almost all points are on yesterday's note.
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