Atoms & Atomic structure
Atoms are the smallest units of matter, made up of protons, neutrons, and electrons. Protons and neutrons form the tiny central nucleus of the atom, while electrons orbit around this nucleus in defined shells or energy levels. The number of protons in the nucleus determines the element and its atomic number. Atoms are electrically neutral overall because they have equal numbers of protons and electrons. Atomic structure explains the identity, stability, and properties of elements and is the basis for all chemical reactions.
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