Dalton's Atomic Theory: Early 19th-century theory proposing that atoms are indivisible and identical spheres., Bohr's Planetary Model: Early 20th-century model refining Rutherford's idea by suggesting that electrons orbit the nucleus in specific energy levels., Thomson's Plum Pudding Model: Late 19th-century model suggesting atoms are composed of positively charged matter with embedded negatively charged electrons., Quantum Model: Developed in the mid-20th century, this model describes electrons as wave-like entities or clouds occupying regions of space called orbitals, rather than fixed paths., Rutherford's Nuclear Model: Early 20th-century model proposing that atoms have a dense, positively charged nucleus surrounded by orbiting electrons.,

Atomic Models

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