The Evolution of the Atomic Model
Do you know about the Evolution of Atomic Models?
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Dalton's Theory
Viewed atoms as tiny, solid balls, indivisible and indestructible particles, which have different masses and chemical properties. Discovered in 1808.
Showed that atoms have (+) particles in the center, and are mostly empty space. Discovered in 1876.
Has electrons moving around the nucleus in a cloud. Discovered in 1932.
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Thomson's theory
Most of the atom's mass and positive charge is concentrated in a small, dense nucleus, while electrons orbit around it. Discovered in 1913.
Describes the atom as a positive sphere with scattered electrons, similar to a raisin bun. He suggested that electrons were embedded in a positive cloud, contributing to the understanding of atomic structure. Discovered in 1897.
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Who discovered protons and nucleus?
Bohr
Rutherford
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Who proposed the existence of energy levels or layers in atoms?
Bohr, 1913
Chadwick, 1932
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Who discovered neutrons?
Democritus
Chadwick
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Who proposed the atomic model with electronic orbitals?
Schrodinger
Democritus
