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Development of the structure of the Atom

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chaise lytinski

on 29 June 2014

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Transcript of Development of the structure of the Atom

JJ Thomson the british physicist was born in 1856. He discovered the electron in a series of experiments that were designed to study the nature of electric discharges of atoms. This was an area that was being investigated by numerous scientists at the time.

The Plum Pudding model
In 1897 Thomson contributed the the existence of electrons in an atoms. This meant that atoms are not invisible and could be seen. His theory also suggested that atoms where spherical and had a positive charge.
Through the Gold Foil Experiment, Rutherford discovered that when Gold Atoms were deflected off of tin foil that some of them must have bounced because of a dense center in the atoms (nucleus). Basically, he discovered the nucleus.
In 1909 he began experiments that were to change the face of physics. He discovered the atomic nucleus and developed a model of the atom that was similar to the solar system. Like planets, electrons orbited a central nucleus. Acceptance of this model grew after it was modified with the quantum theory by Niels Bohr. For his work with radiation and the atomic nucleus, Rutherford received the 1908 Nobel Prize in chemistry.
Ernest Rutherford was a New Zealand born British physicist who became known as the father of nuclear physics.
The bohr model
The Bohr Model has an atom consisting of a small, positively-charged nucleus orbited by negatively-charged electrons.
Niels Henrik David Bohr was a Danish physicist who made foundational contributions to the understanding of the atomic structure and the quantum theory.

He developed the Bohr model of the atom, where he proposed that energy levels of electrons are discrete, and that the electrons revolve in stable orbits around the atomic nucleus, but can jump from one orbit to another.
JJ Thompson
Earnest Rutherfoed
Niels Bohr
Development of the structure
of the Atom

The plum pudding model is the earliest theoretical description of the inner structure of atoms. It was discovered that atoms are specifically placed spheres of positively charged matter in which negatively charged electrons are embedded.

Gold Foil Experiment
By Chaise Lytinski
Full transcript