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Dalton's Atomic Model
- Elements are made of extremely small particles called atoms.
- Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
- Atoms cannot be subdivided, created, or destroyed.
- Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
- In chemical reactions, atoms are combined, separated, or rearranged.
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John Dalton
He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness (sometimes referred to as Daltonism, in his honour). "John Dalton." Wikipedia. Wikimedia Foundation, 09 Feb. 2013. Web. 05 Sept. 2013. -
William Crookes
a British chemist and physicist who attended the Royal College of Chemistry, London, and worked on spectroscopy. He was a pioneer of vacuum tubes, inventing the Crookes tube. Crookes was the inventor of the Crookes radiometer,[1] which today is made and sold as a novelty item.
"William Crookes." Wikipedia. Wikimedia Foundation, 21 Aug. 2013. Web. 05 Sept. 2013. -
J.J Thomson Model (Plum Pudding Atomic Model)
In this model, the atom is composed of electrons (which Thomson still called "corpuscles", though G. J. Stoney had proposed that atoms of electricity be called electrons in 1894[1]) surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged "plums" surrounded by positively charged "pudding". "Plum Pudding Model." Wikipedia. Wikimedia Foundation, 09 May 2013. Web. 05 Sept. 2013. -
J.J Thomson
Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases. "J. J. Thomson." Wikipedia. Wikimedia Foundation, 09 May 2013. Web. 05 Sept. 2013. -
Ernest Ruthford
The Geiger–Marsden experiment (also called the Rutherford gold foil experiment) was an experiment to probe the structure of the atom performed by Hans Geiger and Ernest Marsden in 1909,[1] under the direction of Ernest Rutherford at the Physical Laboratories of the University of Manchester. The unexpected results of the experiment demonstrated for the first time the existence of the atomic nucleus, leading to the downfall of the plum pudding model of the atom, and the development of the Rutherfo -
Ruthford Model
Rutherford's new model[1] for the atom, based on the experimental results, contained the new features of a relatively high central charge concentrated into a very small volume in comparison to the rest of the atom and with this central volume also containing the bulk of the atomic mass of the atom. This region would be named the "nucleus" of the atom in later years. "Rutherford Model." Wikipedia. Wikimedia Foundation, 09 May 2013. Web. 05 Sept. 2013. -
Bohr Model
In atomic physics, the Bohr model, introduced by Niels Bohr in 1913, depicts the atom as small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus—similar in structure to the solar system, but with attraction provided by electrostatic forces rather than gravity.
"Bohr Model." Wikipedia. Wikimedia Foundation, 29 Aug. 2013. Web. 05 Sept. 2013. -
Neils Bohr
a Danish physicist who made foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. "Niels Bohr." Wikipedia. Wikimedia Foundation, 09 May 2013. Web. 05 Sept. 2013. -
Quantum Mechanical Model
The quantum mechanical model is based on quantum theory, which says matter also has properties associated with waves. According to quantum theory, it’s impossible to know the exact position and momentum of an electron at the same time. This is known as the Uncertainty Principle.
"Atomic Structure: The Quantum Mechanical Model." - For Dummies. N.p., n.d. Web. 05 Sept. 2013. -
James Chadwick
English physicist who was awarded the 1935 Nobel Prize in physics for his discovery of the neutron in 1932. "James Chadwick." Wikipedia. Wikimedia Foundation, 09 May 2013. Web. 05 Sept. 2013.
