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Democritis
Democritis was born in 460BC and died in 370BC.Democritis was the first one to come up with the atomic.Democritis was the first person to come up with the theory of atoms and that there are different elements that could be rearranged into other states.He was the first to discover the atom. -
John Dalton
atoms that are in the same element can form together in ratios to form compounds. it showed us the Point where matter is not broken down into anything smaller.Atoms are tiny particles that make up everything. -
John Dalton
John Dalton was born in 1766 in Cumberland England and died when he was 77. John Dalton’s work was influenced by a Greek philosopher named Democritus, who had suggested the idea of atoms centuries earlier than Daltons theory in 1808.He discovered that elements are made up of tiny separate, indestructible particles. These particles cant be destroyed or created. Each element is made up of the same atoms. Other elements are made up of different atoms. -
Avogadro
Avogadro was born on August the 7th in 1776 and died on the 9th of July 1859.He took ideas of the numbers of particle that are inside the atom and then worked out a formula for calculating the number of particles in atoms in one mole.Avogadro was noted for discovering the way of calculating the particle number for 1 mole.Avogadro’s number changed the way that the particle number in one mole was found. -
Jons Jakob Berzelius
He changed the way that we write elements and made it easier and more efficient to write elements and discovered some elements which contributed towards the periodic table. -
Jons Jakob Berzelius
Jons Jakob Berzelius was born on the 20th of august 1779 and died on the 7 august 1848John Dalton influenced Jons Jakob Berzelius work on atomic theory. He then went on and added to John Daltons findings by discovering the elements silicon, selenium, thorium, and cerium. He was noted for his work on discovering the elements silicon, selenium, thorium, and cerium. He was also known for developing the shorthand way of writing elements by giving them a symbol. Eg: H2O=water. -
Sir William Crookes
Sir William Crookes was born on the 17th of June 1832 and Died on the 4th of April.He took influence from scientists that had been working on electric charges and rays that can be created.He was noted for his work in discovering cathode rays. He was studying the effects of sending electric currents through gasses at the time and was experimenting when he found this discovery.His discovery showed that the cathode rays were created by electrodes and a flow of electrically charged particles. -
Wilhelm Conrad Röntgen
Wilhelm Conrad Rontgen was born on the 7th of March 1845 and died on the 10th of February 1923.He started experimenting with different electrical currents and gasses, which he was studying. One day he was experimenting with these types of things and discovered rays which he called X Rays. Wilhelm Conrad Rontgen was noted for his discovery of X Rays. -
Wilhelm Conrad Röntgen
This discovery showed us that when electrons collide with atoms and the metal target a ray called the X Ray is created. -
J.J Thomson
JJ Thomson was born on the 18th of December in 1856.He died on August 30 in 1940JJ Thomson took what J. Dalton had discovered and discovered the theory of an electron and showed this by using the ‘plum pudding model’. the model means that the atom was made up of negatively charged particles ‘plums’ and surrounded by positive charge ‘the pudding’. -
JJ Thomson
He discovered that there were smaller parts inside of the atom and the negatively charged particle were electrons and surrounded by positive charge. This proved that there were even smaller parts to an atom and were negatively charged particles which were balanced by positive surrounding charge. -
Marie Curie
Marie Curie was born on the 7th of November 1867 and died on the 4th of July 1934.She saw how scientists were discovering certain elements and looked at the way they were doing so. She then discovered the elements Polonium and radium. She was noted for her work in discovering the elements Polonium and Radium and for also contributing to discovering radio activity.From these discoveries more elements were added to the periodic table of elements. -
Marie Curie
Also radioactivity was discovered which helped in experiments and research for the future. -
Robert Andrews Millikan
Robert Andrews Millikan was born on the 22nd of March 1868, and died on the 19th of December 1953.Robert Andrews Millikan was influenced by the discovery of the electron. He then went on and discovered the charge of an electron.He was noted for his work on the discovery on the electric charge of the electron. -
Robert Andrews Millikan
He changed the view on the electrons charge. We now know that the electron has a negative charge. -
Ernest Rutherford
This discovery showed us that the atom contains a nucleus and most of the mass is inside the centre of the atom. -
Ernest Rutherford
Ernest Rutherford was born on the 30th of August and Died on the 19th of October 1937.He got ideas from other atomic scientists and then challenged the theories with the gold foil experiment.Rutherford’s gold foil experiment was projecting radiation at an extremely thin sheet of foil. Most went straight through but a small number bounced straight back. This lead him to believe that there must be a central nucleus where most of the mass is and space around the rest of the atom. -
Niels Bohr
Bohr discovered that the electrons inside of the atom orbit around the nucleus, also the number of electrons surrounding the nucleus largely determines that properties of elements.His discoveries showed us that the amount of electrons circling the nucleus is a big part of the chemical properties of certain elements. -
Niels Bohr.
N. Bohr was born on the 7th of October 1885 and died on the 18th of November 1962.Niels Bohr took the work of previous atomic scientists and expanded on their ideas and discovery’s. Bohr discovered that there are electrons inside the atom that circle the nucleus. -
Erwin Schrodinger
Erwin Schrodinger was born on the 12th of August 1887, and died on the 4th of January 1961.E. Schrodinger was influenced by Bohr’s orbit theory and thought that there must be a way to calculate the distribution of electrons to each atom. -
Erwin Schrodinger
He invented a model of the atom. It combined the equations for the behaviour of waves with an equation to give a mathematical model for the distribution of electrons to each atom.He changed our view of atomic theory by showing us a mathematical equation (wave equation) to calculate electron distribution between atoms. -
Henry Moseley
It has shown us that the atomic number equals the number of protons. This shows the order of the periodic table. The table is ordered from the atomic number. -
Henry Moseley
Henry Moseley was born on the 23rd of November 1887, and died on the 10th of August 1915.Henry Moseley took the previous study of atomic theory and discovered that the number of protons is equal to the atomic number. He was noted for his work on the atom which he discovered that the atomic number is equal to the number of protons in one atom of the element. -
James Chadwick
James Chadwick was born on the 20th of October 1891, and died on the 24th of July 1974.James Chadwick took the ideas of JJ Thomas and proved the existence of the neutron.J. Chadwick is noted for the discovery of the neutron and proving that it exists. This proved that there was another part that made up the atom. -
James Chadwick
James Chadwick’s discoveries showed us how the protons in the nucleus stop from reacting with each other. Because the nucleus is so tightly packed the neutrons stabilize the protons. -
Aristotle
Aristotle was born in 384 BC and died in 322BC.He had a theory that nature was made up of only 4 elements (Air, water, fire, earth) He was noted for believing that there are 4 elements that make up the world. He believed that the Gods controlled these. He also believed that they were linked to the seasons.He discovered the 4 main elements that make up our world.
