EVOLUTION OF ATOMIC MODELS

EVOLUTION OF ATOMIC MODELS

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CAN MATTER BE DIVIDED INFINITELY?

Discovery of the electron (1897)

18TH C. (1789)

Lavoiser scale: permeted obtainig the weight laws.The most important is (LCM9.

GREEKS: based on pure reason, NO experiments

In 1897 Thomson discovered a particle with a negative charge, that was smaller than the atom. He did it using a gas discharge tube.

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4c.bc (yes)

5 c.bc (NO)

19TH C.(1803-1808)

Here matter is continuous and can be divided indefinitely.Bases: wather, earth, fire, air and ather

Here matter is discovered, it was called divisible, which in Greek is atomMatter cannot be divided.

Dalton started the first model of moden area, he postulated a solid atom similar to an sphere

BY Berta Pena, Laia Vico, Erin Sanz, Beatriz C. R.

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Thomson (1904)

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Was an English physicist that helped to revolutionize the knowledge of atomic structure by his discovery of the electron.

RUTHERFORD ATOM MODEL (1911)

Rutherfod proposed a hollow atom model made up of a small and positive nucleus, surrounded by an electron shell, where the electrons are spinning in circular orbits. and particles can go through it without being diverted.

ATOMIC SPECTRA

He explains the origin of the electron with a plum pudding model, which is a solid model that introduces electrons inside a sphere of positive mass.

These spectra are discontinuous, that means that not all the orbitals are possible.

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RUTHERFORD’S EXPERIMENT (1910-11)

ATOMIC COLLAPSE

bohr (1913)

It's when the electron orbits around the nucleus. When energy is released it finally falls down to it.

This experiment consisted of bombarding gold atoms with alpha particles, to see how particles went through the gold foil..

Was the first Danish physicist that applied the quantum concept and maintained the concept of the hollow atom that limited the number of orbits in a fulfilled criteria.