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Copy of Atomic History Timeline

Timeline of atomic history including 15 of 21 scientists
by

Roxy Bell

on 28 May 2014

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Transcript of Copy of Atomic History Timeline

Atomic
History
Timeline
Democritus
John Dalton
J.J. Thomson
Ernest
Rutherford

Niels Bohr
"Albert Einstein Biography - The Life and Achievements of Albert Einstein." Albert Einstein Biography - The Life and Achievements of Albert Einstein. N.p., n.d. Web. 12 Nov. 2012. <http://inventors.about.com/library/inventors/bleinstein.htm>.
"Atomic Structure Timeline." Atomic Structure Timeline. N.p., n.d. Web. 12 Nov. 2012. <http://atomictimeline.net/index.php>.
"John Dalton." Homepage of the Chemical Heritage Foundation. N.p., n.d. Web. 12 Nov. 2012. <http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/the-path-to-the-periodic-table/dalton.aspx>.
"Joseph-Louis Proust (French Chemist)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 12 Nov. 2012. <http://www.britannica.com/EBchecked/topic/480555/Joseph-Louis-Proust>.
"Quantum Theory." Quantum Theory. N.p., n.d. Web. 12 Nov. 2012. <http://www.thebigview.com/spacetime/quantumtheory.html>.
"Albert Einstein Biography - The Life and Achievements of Albert Einstein." Albert Einstein Biography - The Life and Achievements of Albert Einstein. N.p., n.d. Web. 12 Nov. 2012. <http://inventors.about.com/library/inventors/bleinstein.htm>.
"Atomic Structure Timeline." Atomic Structure Timeline. N.p., n.d. Web. 12 Nov. 2012. <http://atomictimeline.net/index.php>.
"John Dalton." Homepage of the Chemical Heritage Foundation. N.p., n.d. Web. 12 Nov. 2012. <http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/the-path-to-the-periodic-table/dalton.aspx>.
"Joseph-Louis Proust (French Chemist)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 12 Nov. 2012. <http://www.britannica.com/EBchecked/topic/480555/Joseph-Louis-Proust>.
"Quantum Theory." Quantum Theory. N.p., n.d. Web. 12 Nov. 2012. <http://www.thebigview.com/spacetime/quantumtheory.html>.
Work Cited
By Roxy
460 BC
If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further? Democritus thought that it ended at some point, a smallest possible bit of matter. He called these basic matter particles, atoms. He called theses atomas, meaning "uncuttable".
Democritus was a philosopher, so he didn't really experiment. He theorized and rationalized ideas.
1810
John Dalton contributed to the atomic theory by using chemical analysis to determine the relative diameter of the atom, which he hypothesized made up all gases such. He proposed the ideas of atoms making up elements; atoms couldn’t be divided or created; and atoms of a given element are either identical or different in size, mass, and other properties.
Dalton's Atomic Model
Democritus atomic model
1897
J.J. Thomson was able to identify the existence of electrons in atoms which contributed to the atomic theory by giving more scientific evidence to prove its authenticity. Thomson also constructed the plum pudding model which showed electrons surrounded by a positively charged "pudding".
He discovered the electron in a series of experiments designed to study the nature of electric discharge in a high-vacuum cathode-ray tube Thomson interpreted the deflection of the rays by electrically charged plates and magnets as evidence of &quotbodies much smaller than atoms&quot that he calculated as having a very large value for the charge-to-mass ratio.
Thompson's atomic model
Using gold foil and an alpha particles emitter, Ernest Rutherford discovered that atoms have a positive, dense, central region called the nucleus. He also discovered the concept of radioactive half-life in earlier work.
Rudderfords atomic model
Proposed the Bohr Model of an atom,
consisting of the symbol of an atom in the center and a visual of the electrons on the electron rings around the nucleus.
Rutherford’s atomic model:
This model, created 1911, helps represent Ernest Rutherford’s theory of an atom being charged in its very small nucleus with electrons circling the nucleus.
Bohr’s contribution to the atomic theory was his understanding of the actual structure of the atom which was discovered in 1913. Bohr, like Dalton, didn't use equipment to discover his model of the atom. He was a theoretical physicist so he built upon Rutherford's atomic model with electrons circling around a nucleus.
Bohr's Atomic Model
1904
1913
1904
1913
Niels Bohr
Full transcript