Atomic Theory Scientists

Democritus

460

Democritus was born in 460 BC and died in 370 BCDemocritus said that matter is made of tiny things and you could not break it. He also said that atoms had different shapes, sizes, masses and arrangement. His atomic models looked like an oval, spikey ball and a cube.
Bibliography:
McGilvray, Munsey. "Reich-chemistry - Mcgilvray-munsey." Reich-chemistry - Mcgilvray-munsey. N.p., n.d. Web. 26 Mar. 2013.

Isaac Newton

Dec 25, 1642

Isaac Newton was born on the 25th December 1642 and died on the 20th March 1727.Newton believed that there were tiny particles that were floating/swimming everywhere.He studied gases and had an idea that atoms exsist.
Bibliography:
"Isaac Newton - History of the Atomic Theory." History of the Atomic Theory. N.p., n.d. Web. 26 Mar. 2013.

John Dalton

Jan 1, 1766

John Dalton was born in 1766 and died in 1844.Dalton discovered that matter is made of atoms, they are indestructible, atoms with the same element are the same in mass and properties, compounds are made of 2 or more different atoms.Dalton worked on gases and was fascinated by it. He found out that all matter was made up of small individual particles.
Bibliography
Iun. "Dalton's Atomic Theory." Dalton's Atomic Theory. N.p., n.d. Web. 26 Mar. 2013.

Wilhelm C. Rontgen

Mar 27, 1845

Wilhelm Rontgen was born on the 27th March, 1845 and died on the 10th February, 1923. Rontgen discovered X-rays from using a discharge tube surrounded in a thick black carton. Barium plantinocyanide covered one side. Rontgen did the first x-ray on his wife’s hand.
Bibliography:
McGilvray, Munsey. "Reich-chemistry - Mcgilvray-munsey." Reich-chemistry - Mcgilvray-munsey. N.p., n.d. Web. 26 Mar. 2013.

Henri Becquerel

Dec 15, 1852

Henri was born on the 15th December, 1852 and died on the 25th August, 1908. He was French. Henri discovered radioactivity. One of Becquerels work included working with the plane polarization of light.
Bibliography:
"Biography." Henri Becquerel -. N.p., n.d. Web. 26 Mar. 2013.

J.J. Thomson

Jan 1, 1856

Thomson was born in 1856 and died in 1940Thomson found out about electrons. That proved that an atom was made from protons, electrons and neutrons.One of Thomsons experiments was on determining the nature of positively charged particles. His atomic model was positive by charge 'pudding' with electrons.
Bibliography:
Chemheritage. "Joseph John Thomson." Homepage of the Chemical Heritage Foundation. N.p., n.d. Web. 26 Mar. 2013.

Max Planck

Apr 23, 1858

Max Planck was born on the 23rd April, 1858 in Germany and died on the 4th October, 1947.Max came up with the quantum of action aka Planck;s constant h. It explains the pattern of light intensity emitted from a black body at any given amount.Planck discovered that energy isn’t a continuous flowing organism, it is carried in small discontinuous units. Planck names it quanta and described it as “the pennies of the atomic world”.
Bibliography:
"Biography." Max Planck -. N.p., n.d. Web. 26 Mar.

Marie Curie

Nov 7, 1867

Marie was born on the 7th November, 1867 and died on the 4th July, 1934.Marie and her husband discovered the atoms Radium and Polonium. They discovered the atom Pithblende inside a mineral.
Bibliography:
McGilvray, Munsey. "Reich-chemistry - Mcgilvray-munsey." Reich-chemistry - Mcgilvray-mu

Robert Millikan

Mar 22, 1868

Robert was born on the 22nd March, 1868 and died on the 19th December, 1953.Robert discovered the charge of the electron. He experimented with oil droplets. They through in a positively charged plate and fell on to a negatively charged plate. Negatively charged x-rays were then shot in between the 2 plates. The oil droplets that were touched floated in the air or attracted to the positively charged plate.
Bibliography:
McGilvray, Munsey. "Reich-chemistry - Mcgilvray-munsey." Reich-chemistry -

Earnest Rutherford

Aug 30, 1871

Earnest Rutherford was born in New Zealand on 30th August, 1871 and died in Cambridge on 19th October, 1937Rutherford discovered nucleusIn one of Rutherfords famous experiments, he fired alpha particles to a tiny thin piece of gold foil. Some went through the foil and some bouced off the foil. His atomic Model is positive and has electrons.
Bibliography:
McGilvray, Munsey. "Reich-chemistry - Mcgilvray-munsey." Reich-chemistry - Mcgilvray-munsey. N.p., n.d. Web. 26 Mar. 2013.

Niels Bohr

Oct 7, 1885

Niels Bohr was born in Copenhagen on the 7th October, 1885 and died on the 18th November, 1962Although Rutherford had already discovered nucleus in an atom, Bohr discovered that electrons travel in orbits around the nucleusBohr discovered that the outer orbital could have more electrons the the inner orbitalThe outer electrons can tell what the chemical prop.
Bibliography:
McGilvray, Munsey. "Reich-chemistry - Mcgilvray-munsey." Reich-chemistry - Mcgilvray-munsey. N.p., n.d. Web. 26 Mar. 2013.

Henry Moseley

Jan 1, 1887

Henry Moseley was born in 1887 and died in 1915.Moseley developed the X-Ray spectra to study atomic structure. This has made the positioning of elements in the Periodic table more accurate.
Bibliography:
"Henry Moseley." Henry Moseley. N.p., n.d. Web. 26 Mar. 2013.

Erwin Schrodinger

Aug 12, 1887

Erwin Schrodinger was born on the 12th August 1887 and died on the 4th January 1961Schrodinger made a wave equation which was based from Heisenberg’s principle, stating that the position of electrons cannot be determined, only the area it is in.He discovered the electron cloud theory. His atomic model has neutrons, protons, nucleus and electrons
Bibliography:
McGilvray, Munsey. "Reich-chemistry - Mcgilvray-munsey." Reich-chemistry - Mcgilvray-munsey. N.p., n.d. Web. 26 Mar. 2013.

James Chadwick

Oct 20, 1891

Born 20th October 1891 and died 24th July 1974.Chadwick discovered that when beryllium is attacked with positively charged alpha particles, a beam with a lot of power was developed. He also discovered that the beam was not diverted by the electric or magnetic fields, so it had neutral particles – neutrons. His atomic model has necleus, neutrons, protons and electrons
Bibliography:
"James Chadwick - History of an Atom." James Chadwick - History of an Atom. N.p., n.d. Web. 26 Mar. 2013.

Aristotle

Mar 2, 2022

Aristotle was born in Greece in 384 BC and died in 322 BCAristotle had the idea that all matter is made up of fire, water, earth and air. He also said that could be qualities to the elements: dryness, hotness, coldness and moistness. Water is wet and cold, fire is dry and hot, air is hot and wet and the earth is dry and cold.
Bibliography:
"Aristotle Atomic Theory." Universe Today RSS. N.p., n.d. Web. 26 Mar. 2013.