-
460
Democritus
Democritus lived from 460 BC to 370 BC he was an ancient Greek philosopher. Everything is made up of atoms and are not indivisible. Between atoms are empty spaces. Atoms are indestructible. There are infinite number of atoms and different kinds of atoms which all of them differ in size and shape. Our own senses distinguished them from each other by their size and shape. -
John Dalton
John Dalton was born on September 6, 1766 in Eaglesfield, England. He died in July 26, 1844. John Dalton said that matter could not be broken down into anything smaller. He used ‘atom’ to describe the tiny particles. Dalton didn’t have any strong evidence for his hypothesis. It took a long time for his ideas to become identified as the theory it is know to be today. Not all scientists agreed with him. -
Michael Faraday
Michael Faraday was born into a poor family in London, September 22, 1791. He’s best know for the uncovering the electromagnetic induction and for the laws of electrolysis. His biggest development in electricity was the invention of the electric motor. All of Michael’s experiments have now formed the basis of modern electromagnetic technology. -
James Clerk Maxwell
James Clerk Maxwell was a Scottish mathematician and physicist. (June 13, 1831– 1879). His most important achievement was putting together the classical electromagnetic theory. James wanted to present electricity in its simplest form. His formulation of electricity and magnetism was published in a ‘Treatise on Electricity and Magnetism’, 1873. His formulas are today known as the Maxwell equations. -
Dmitri Mendeleev
Dmitri Mendeleev was born on February 8, 1834 Tobolsk, Siberia in he died in 1907.Dmitri is best known for his work on the periodic table. He arranged the 63 known elements into a periodic table based on the atomic mass. Which he then published it in Principles of Chemistry, 1869. The first periodic table was made by arranging the elements in ascending order, atomic weight and by similarities. -
J.J Thomson
British physicist Joseph John Thomson discovered the electron in 1897.He was born in Cheetham Hill, which is a suburb of Manchester on December 18, 1856. He discovered the electron by doing different experiments designed to study the electric discharge in a high-vacuum cathode-ray tube. It was an area being looked at my many different scientists all at the same time. -
Hantaro Nagaoka
Hantaro Nagaoka was born in Ōmura, Nagasaki on the 15th of August 1865. The two influences of Boltzmann’s Kinetic Theory of Gases and Maxwell’s stability of Saturn’s rings lead to the development of the Saturnian model of the atom. The Saturnian model of the atom was created in 1904. The model he created was all about the explanation of the stability of the Saturn rings. Saturn’s rings are stable because the planet they rotate is massive. -
Ernest Rutherford
Ernest Rutherford was born on August 30, 1871 in Nelson, New Zealand. He passed away in Cambridge on October 19, 1937. The atomic model Rutherford designed is well known as a symbol showing electrons around the nucleus exactly how the planets orbit the sun. This symbol has been used by various people around the world as a symbol for atoms and atomic energy. -
Albert Einstein
Albert Einstein was born in Ulm, Germany on March 14, 1879. Einstein died on April 18, 1955. He published many of his research papers including the special theory of relativity which now is world famous equation “e = mc2”.• Albert Einstein is best known for the publish of “e = mc2”. In 1915, 10 years later Einstein finished his general theory of relativity. Einstein’s theories are now today practical applications such as the tevelvison, remote control, automatic door openers, lasers, an -
Hans Geiger
Hans Geiger was born on September 30, 1882 and died September 24 1945. Geiger is a German physicist and he was also born in Germany. Geiger was one of two who invented the ‘Geiger Counter’, which is a portable machine, that counts/detects alpha particle. German physicist Walther Muller was co-inventor. Geiger also co-invented a predecessor to the ‘Geiger Counter’ that was used in their radiation studies. -
Niels Bohr
Niels Henrik David Bohr was born in Copenhagen on October 7, 1885. Niels Bohr made an atomic model, which was sometimes called the Rutherford-Bohr Model. The model consisted of a small, positively charged nucleus orbited by negatively charged electrons. Bohr believed that the lowest energy is found in the smallest orbit and that the energy of the orbit is related to its size. -
Erwin Schrodinger
Erwin Schrodinger was born on August 12, 1887 in Vienna.• He passed away on the 4th of January 1961. Schrodinger created some equations that described the motions and energies of electrons. He believed that electrons could only orbit around the nucleus is a specific way. He proved that you could tell where an electron is at any given time. He also demonstrated that electrons could be waves and particles. -
Henry Moseley
Henry Moseley was born in the southwestern coast of England on November 23, 1887. He is a British physicist and he is best known for his work on reorganizing the periodic table based upon atomic number instead of atomic mass. Many scientists believed that if Moseley stayed around longer he could have helped a great deal towards the knowledge of the atomic structure. Moseley was shot dead on August 10, 1915 during the Battle of Gallipoli, in Turkey. -
James Chadwick
James Chadwick was born in Cheshire, England on the 20th of October 1891. He died on July the 24th, 1974. James Chadwick made a very important discovery in nuclear science. He discovered and proved that neutrons exist. James used the numbers of protons in an atom to determine the atomic number. James Chadwick is the found of the fourth subatomic particle, the neutron. -
Period: to
Democritus
• Democritus lived from 460 BC to 370 BC he was an ancient Greek philosopher.• Everything is made up of atoms and are not indivisible.• Between atoms are empty spaces.• Atoms are indestructible.• There are infinite number of atoms and different kinds of atoms which all of them differ in size and shape.• Our own senses distinguished them from each other by their size and shape. -
Aristotle
Aristotle is an Ancient Greek philosopher he was born in 384 B.C in Stagira’ Greece, he died in 322 B.C. Aristotle didn’t believe in Democritus theory. Aristotle contributed to the Atomic theory because he believed in the four elements air, earth, water and fire. Aristotle felt that it didn’t matter how many times you would cut any type of matter in half, you would always end up with a smaller piece of that matter.
