Niels Bohr - The scientist who proposed that electrons orbit the nucleus in specific energy levels or shells., Valence shell - The outermost electron shell of an atom, responsible for chemical bonding and reactivity., Octet rule - The outermost electron shell of an atom, responsible for chemical bonding and reactivity., Lewis symbol - The simplified atomic diagram that represents only the valence electrons of an atom., anion - The type of ion formed when an atom gains an electron.,

Understanding Atoms and its Subatomic Particles

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