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Model (Answer taken from the word search), Proponent/Year introduced Nuclear Planetary Plum Podding Jan tum d sphere Main features Contribution to understanding of the atomic structure
John Dalton introduced the Solid Sphere Model in 1803.
He proposed that atoms are solid, indivisible spheres and that each element's atoms are identical in mass and properties.
This model contributed to the understanding of atoms as the basic building blocks of matter.
Plum Pudding Model
J.J. Thomson introduced the Plum Pudding Model in 1904.
He suggested that atoms are composed of electrons scattered within a "soup" of positive charge, similar to plums in a pudding.
This model introduced the idea that atoms are divisible and contain internal structures, including electrons.
Nuclear Model
Ernest Rutherford introduced the Nuclear Model in 1911.
He proposed that atoms have a small, dense, positively charged nucleus, with electrons orbiting the nucleus like planets around the sun.
This model contributed by discovering the nucleus, disproving the Plum Pudding Model, and showing that most of the atom is empty space.
Planetary Model
Niels Bohr introduced the Planetary Model in 1913.
He suggested that electrons orbit the nucleus in fixed energy levels or shells and that electrons can jump between levels by absorbing or emitting energy.
This model explained atomic emission spectra and introduced the idea of quantized electron energy levels.
Quantum Model
Erwin Schrödinger and others introduced the Quantum Model in 1926.
They proposed that electrons exist in probability clouds called orbitals rather than fixed orbits, using mathematical equations to describe the likelihood of finding an electron in a certain position.
This model provides a more accurate and detailed description of electron behavior, forming the basis of modern quantum mechanics.
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