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Democritus
Democritus was a Greek who lived from 460 BC to 370 BC. He was the first scientist to discover atomic theory. He is known by some people as the father of modern science. He clams that atoms are physically invisible and that there are all different shapes and sizes of atoms. He also seemed to think that everything is made up of atoms and that between atoms lie empty space. He says that solid atoms such as iron atoms are strong and have hooks that lock them into a solid. But the smooth atoms such -
John Dalton
• John Dalton was born in 1766 and dies in 1844.• He was a teacher and a public lecturer.• He calculated atomic weights to find out the likely atomic structure of each compound.• Two elements would combine in a set sequence.• The first compound would have one atom a and one atom b, the second would have one atom a and two atom b and the third would have two atom a and one atom b.• He believed that particles in gases had different -
Niels henrik abel
Born 5th of august 1802. Attended the cathedral school at Christiania.His first work was solving the quintic equation by radicals. This was published in 1824.He then went to Germany and france when they were enabled to do the first volume of crelle’s Journal in 1825.He visited Heinrich Schumcher the astronomer at Hamburg. He was in Berlin for 6 months where he became intimate with August Leopold Crelle who was then about to publish his mathematical journal. -
George Johnstone Stoney
George was an Irish scientist who made expressing contributions to the study od spectra. Different substances absorb these and is a light of various colours emitted. He attended Trinity College Dublin and had become the assistant Professor at Lord Rosse’s Observatory at Birr. He then went to Queens College Galway and became appointed Professor of natural Philosophy. After this he moved to Queens University where he became Secretary of the Administrative Headquarters of the Queens college.His m -
Michael Faraday
Michael Faraday discovered the principle behind the electric transformer and generator in 1831. Following the crucial discovery it allowed electricity to be transformed into a powerful new technology. Within the decade developed new ideas about electricity. Due to bad health, Michael Faraday did less research in the early 1840’s. after passing away in 1867, he was recognised for his contribution to science and was given the name farad. -
Joseph John
A high vacuum cathode-ray tube was an area that was investigated by numerous scientists but john discovered the electron in a series of experiments designed to study the nature of electric discharge in this.Thomson explained that bodies that are much smaller then atoms are evidence to charged plates and magnets. Thomson purposed a sphere as a model of a atom. This is a positive matter in which electrons are arranged by electrostatic forces. -
Robert Andrews Millikan
Robert was born on the 22nd of March 1868 in Morrison. He went to Maquoketa High School in his childhood. He worked as a court reporter but then went to Oberlin College in 1886. He admired Greek and Mathematics. He graduated in 1891. After this he wanted to teach elementary physics so he took a two-year teaching post. While he was doing this he noticed his interest in this subject and then carried it on to Columbia University. After he received his PhD for research of polarization light emitted -
henry moseley
Born 1887, a british chemist henry mosely developed x-ray spetra to sudy aomic structure. This discovery resulted in the occurance of a more accurate positioning of the elemtns in the periodic table. Due to moseleys work the modern table is basen on the atomic numbers of elements. In 1913 henry announced the results of his measurements of the wavelengths of the X-ray spectral lines of a number of elements.In 1915, mosely was killed while fighting in Gallipoli. Which was a tragic result of the -
Henry Gwyn
Henry was an English physicist. He experimented that the properties of an element are determined by the atomic number.He established the atomic number and the charge of the atomic nucleus relationship.His first researches were about radioactivity and beta radiation in radium. After this he studied x-ray spectra of the elements. After heaps of experiments he found a relationship between the frequencies of corresponding lines in the x-ray spectra. He reported in a published paper that frequenci -
Max Planck
Max’s work ‘planck’s constant h’ was published in the paper in the 1900’s. This was about the pattern of the light.Max described the quanta as the pennies of the atomic world. He explains that each quantum’s energy is equal to the frequency of radiation multiplied by the universal constant.Max was buffing or befuddling to other scientist about his physical theory.He provided a new understanding of the structure of light and radiation. -
Ernest Rutherford
Ernest Rutherford was born into wealthy family in new Zealand. After studying he became a chemist who helped create nuclear physics. During his lifetime he contirubuted to science a great deal.Rutherford along with fellow chemists approved the Geiger-Marsden experiment to examine to structure of the atom. This experiment resulted in the survival of the atomic nucleus and became a significant part of Rutherford’s version of the model of the atom. Rutherford designed the well-recognised symbol -
Hantaro Nagaoka
Hantaro was the professor at the University of Tokyo. He was the first scientist to propose a Saturnian atomic model. It looked like Niels Bohr’s atomic model because the electrons looked like Saturn’s rings orbiting around the nucleus, which contains a positive electric charge.He announced his work at the Tokyo society in December 1903 then again the following year at the British academy journal Philosophical Magazine. He said that the electrons turning around the atomic nucleus would slowly l -
James chadwick
James was in Germany at the beginning of world war one for his scholarship. After 4 years he returned back to England and went to Cambridge University to work in the nuclear physics lab with Ernest Rutherford. Ernest kept an eye on James’s PhD in 1921. James became assistant director of the lab. James liked to forces mainly on radioactivity. Ernest had a theory about the atoms nucleaus and suggested on the lifting of a neuron, a non charged particle within the atoms nucleus; but others researche -
Niels Bohr
Niels Bohr was most recognisedfor his work on the theory of the structure of the atomic model. Bohr made important developments on Ernest Rutherford’s theory concerning the path that the electrons follow. He suggested that the elctrons travel on larger orbits therefore the outer orbits could hold more electrons than the inner ones. He was awarded a noble prize for his new atomic model in 1922. -
Erwin Schrödinger
An Austrian Physicist Erwin Schrödinger took the Bohr atom one-step further in 1926. He explained how to find a electron in a certain position. This atomic model is named the quantum mechanical model of the atom. This model doesn’t define the exact track of an electron unlike the Bohr model. This model introduced the concept of sub energy levels because the nucleus surrounds the electron cloud.