Atomic Theory Timeline

Democritus live in Abdera. He was born in 460 BC. Democritus believed that atoms were specific to the material which they composed.Democritus discovery this because he believed that the atom was unbreakable into smaller parts. Democritus was the man to discover the atom. http://www.abcte.org/files/previews/chemistry/s1_p1.html

Dalton was born in September 6, 1766. Dalton live in Eaglesfield and Manchester. Dalton reason was that all matter was composed of atoms, indivisible and indestructible building blocks. Dalton in 1803 to propose a modern theory of the atom based on the following assumptions. Dalton experiment was Dalton's Atomic Theory. When Dalton was Twelve, he was teaching at a local school. https://www.biography.com/scientist/john-dalton

Ferdinand was born in June 6, 1850. He live in Germany. Ferdinand discovery of crystalline materials that act as rectifiers, allowing current to flow in one direction only. Ferdinand made patents for the Wireless Electronic Transmission of Signals Over Surfaces and the patent for Means for Tuning and Adjusting Electric Circuits. Ferdinand experiment is Cathode ray tube. https://www.britannica.com/biography/Ferdinand-Braun

Thomson was born in December 18, 1856. He live in United Kingdom and Cheetham Hill. Thomson discover the electron by experimenting with a Crookes. Thomson also studied positively charged particles in neon gas. Thomas Experiment was Plum Pudding Atomic Model. Thomas won a Nobel Prize in Physics. https://www.sciencehistory.org/historical-profile/joseph-john-j-j-thomson

Rutherford was born on August 30,1871. Rutherford live in Canada, Nelson, England. Rutherford is known as really focusing in his studies of radioactivity and the atom. He postulated the nuclear structure of the atom, discover alpha and beta rays. Rutherford experiments are Rutherford model and Gold Foil Experiment. Rutherford has a college name after him in Auckland. https://www.sciencehistory.org/historical-profile/ernest-rutherford

Bohr live in Copenhagen. Bohr was born October 7,1885. He believed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Bohr discover the electrons travel in orbits around the nucleus, the number of electrons in the outer orbit determines the properties of an element. Bohr Experiment was Bohr Planetary Model. Bohr in the University that he was in, he would set of explosions in the lab. www.biography.com/scientist/niels-bohr

Schrodinger was born in August 12, 1887. He lived in Dublin and Vienna. Schrodinger used mathematical equations to describe the likelihood of finding an electron in a certain position. Schrodinger made this discovery in his late 30s, with most theoretical physicists sharing groundbreaking finds in their 20s. Schrodinger got his PhD at the age of 23.Schrodinger experiments are Quantum Mechanical model and Electron cloud model. https://www.biography.com/scientist/erwin-schrdinger

Chadwick was born in October 20, 1891. He live in Manchester, Endland. Chadwick discover that neutrons are located in the center of an atom, in the nucleus along with the protons.Chadwick bombarded beryllium atoms with alpha particles. Chadwick discovered the neutron in 1932 and was awarded the Nobel Prize for Physics in 1935. https://www.famousscientists.org/james-chadwick/

Atomic Theory Timeline

Democritus

John Dalton

Karl Ferdinand

J.J Thomson

Ernest Rutherford

Niels Bohr

Erwin Schrodinger

Jame Chadwick