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John Dalton
John Dalton was a English chemist. 2 of the most significant contributions John Dalton had made to science was that he discovered color blindness and established the key foundations of atomic theory.This was called the Law of Multiple Proportions or mostly known as Daltons Law.Later he discovered color blindness which he also suffered. He discovered that 5% of males and less than 1/10th percent of females in population were colorblind. -
J.J Thompson
J.J Thompson has invented a atomic model called the ‘Plum Pudding’ model. This was after he discovered the electron. This was to portray the positively and negatively charged electrons simply in a 3D model. He studied deflecting the cathode rays in a electric field using metal plates. In his experiment the cathode rays moved towards the positively charged plate proving that the ray must be negatively charged. -
Marie Curie
The following paragraph located on the pages document: ATOMIC THEORY. Manik Liyanage -
Ernest Rutherford
Ernest Rutherford firstly discovered that all radioactive elements emit 2 kinds of radiation: positive and negative charges. He developed a model of atoms which looks like a solar system. Along with this he discovered the atomic nucleus. He was a extremely intelligent man. Within 7 years of studying he published 80 papers! Due to his achievements he recieved a Nobel prize in Chemistry. -
Henry Mosely
The contribution English physicist Henry Moseley made to ‘The Elements of Periodic table’ was that he established sorting the elements into the order of the atomic numbers. Initially Henry Moseley was studying X rays given off metals which lead him to develop the Moseley X ray spectra. After noticing that every element had unique number of protons, he called it the ‘atomic number’ which is how the ‘Elements of the Periodic table’ is categorized into.Later Henry died in 1915 at Gallipoli in WW1. -
Niels Bohr
Niels Bohr was a renown scientist who contributed to science by establishing the theory that energy is transferred only in certain well defined quantities, in 1913. His theory also explains that electrons move in orbits. He discovered the key foundations of quantum theory which was the physical behaviours of atoms. -
Francis Aston
Francis Aston was a student of Birmingham University to study chemistry and physics. The biggest contribution Francis made to science was that he discovered isotopes. Isotopes are when the same element has equal number of protons but a different number of neutrons in the nucleus. For example Hydrogen is a isotope. Later he won a Nobel Prize for chemistry in 1922 for his discovery. He devoted the remaining years of his career to create the ‘mass spectrograph’ which he succeeded in developing. -
Erwin Schrodinger
Erwin Schrodinger was a Austrian physician who studied waves and established the 'wave equation'. He also created a 3 dimensional atomic model which deepened his understanding of electrons. His model proposes that a electron represents a wave. The Schrodinger model shows us where electrons are likely to be found and the probability of in which region a electron can be at any given time. -
James Chadwick
The following paragraph located on the pages document: ATOMIC THEORY. Manik Liyanage -
Murry Gellmann
Murray made a very significant contribution to atomic theory: That neutrons and protons are made up of quarks. He established facts about quarks: That every neutron and proton has three. There are up quarks and down quarks. Quarks make up all visible matter and they are 10 (to the power of 15) mm in size.
