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John Dalton
John Dalton was an English chemist that contributed to the research in color blindness and the atomic theory, a scientific theory of the nature of matter stating that matter is composed of units called atoms. "John Dalton." Wikipedia. Wikimedia Foundation, 09 Feb. 2013. Web. 03 Sept. 2013. -
Dalton's Model
The theory of the Dalton's model was based that the atoms of different elements could be recognized by how much they weight. Even though tt was not as accurate because he of a mistake in believing that the simplest compound of two elements were formed from atoms of each element in a 1:1 ratio
"Dalton Atomic Theory." Dalton Atomic Theory. N.p., n.d. Web. 03 Sept. 2013. -
William Crookes
British chemist and physicist discovered cathode rays had the following properties: travel in straight lines from the cathode; cause glass to fluoresce; impart a negative charge to objects they strike; are deflected by electric fields and magnets to suggest a negative charge; cause pinwheels in their path to spin indicating they have mass. "Atomic Structure Timeline." Atomic Structure Timeline. N.p., n.d. Web. 04 Sept. 2013. -
J.J Thomson
a British physicist was credited with the discovery and
identification of the electron. Besides, he also showed that cathode rays were composed of a previously unknown negatively charged particle and credited with finding the first evidence of isotopes. "J. J. Thomson." Wikipedia. Wikimedia Foundation, 31 Aug. 2013. Web. 03 Sept. 2013. -
Ernest Rutherford
A New Zealand-born physict and chemist, his atomic theory describes atom as having a central positive nucleus surrounded by negative orbiting electrons. Establishing that the nucleus was very dense, small and positively charged. He came to this conclusion by the results of his gold foil experiment. "Rutherford - Atomic Theory." Rutherford - Atomic Theory. N.p., n.d. Web. 04 Sept. 2013. -
Plum Pudding Atomic Model
In this model, the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged "plums" surrounded by positively charged "pudding".In Thomson's model, electrons were free to rotate in rings which were further stabilized by interactions between the electrons "Plum Pudding Model." Wikipedia. Wikimedia Foundation, 30 Aug. 2013. Web. 05 Sept. 2013. -
Rutherford Model
Rutherford invented the Rutherford Model where he demonstrated that the atom has a tiny, heavy nucleus. Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure. "Rutherford Model." Wikipedia. Wikimedia Foundation, 28 Aug. 2013. Web. 04 Sept. 2013. -
Bohr Model
Niels Bohr developed the Bohr model of the atom with the atomic nucleus at the center and electrons in orbit around it. Also, he helped develop quantum mechanics, in which electrons move from one energy level to another in discrete steps, instead of continuously. "Niels Bohr." Wikipedia. Wikimedia Foundation, 09 Mar. 2013. -
Niels Bohr
Niels Bohr made foundational contributions to understanding atomic structure and quantum mechanics "Niels Bohr." Wikipedia. Wikimedia Foundation, 09 Mar. 2013. Web. 03 Sept. 2013. -
Quantum Mechanical Model
This model is compared to Bohr's model, it is based on mathematics and it is used to explain observations made on complex atoms and it works for all the elements. SparkNotes. SparkNotes, n.d. Web. 05 Sept. 2013. -
James Chadwick
English physicist who discovered the neutron, a particle without an electric charge, in 1932. "James Chadwick." Wikipedia. Wikimedia Foundation, 09 Mar. 2013. Web. 03 Sept. 2013.
