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Antoine Lavoisier
He is referred to as the “Father of Chemistry”. He helped write the modern system of the nomenclature of chemical substances and he studied, then created a theory, for the chemical reactivity of oxygen. In 1772, he started studying chemical reactions such as combustion, calcination, oxidation, and respiration of metals. -
Period: to
Atomic Timeline
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Joseph Louis Proust
Born in France, he became known for helping to prove the idea that every pure element is made up of elements in a specific proportion. His ideas were eccepted by about 1808. He was the first to use hydrogen sulfide as a reagent. He also gave his chemical analysis results in terms of percentage weights. -
Solid Sphere model
proposed by John Dalton -
John Dalton
Discovered through experiments on gases that the total pressure of a mix of gases amounts to the sum of the partial pressures that each has exerts while in the same space. This officially became known as Dalton's Law of Partial Pressured in 1803. He also postulated a law of thermal expansion during the early 1800s. It illustrated the heating and cooling reaction of gases to expansion and compression. Discovered that Atoms are solid -
Michael Faraday
He helped coin the terms ‘electrode’, cathode’, and ‘ion’. -
Ernest Rutherford
Studied the effects of X-rays on the conductivity of gases, resulting in a paper about dividing atoms and molecules into ions. Proved that the nucleus is positive and that the elctrons are outside the atom this is known as the planetary model -
J.J. Thomson
He started by studying cathode rays for which he devised better equipment and procedures than what had been used and done before. He decided that matter consists of tiny particles that are smaller than atoms. Came up with chocolate chip cookie model -
Henri Becquerel
His greatest discovery was radioactivity -
Plum Pudding
Discovered by J.J. Thomson, atoms are solid spheres that are made up of solid poitive mass with small negative particles embedded in it -
Max Planck
He came up with Plankck’s constant, which he states that energy for a resonator of frequency v is h where h is a universal constant. -
Planetary Model
Made by Ernest Rutherford, proved that the nucleus of an atom is positive and that the elctrons are outside of it. -
Niels Bohr
In a series of articles he theorized that atoms give off electromagnetic radiation. This is due to electrons jumping to various orbit levels. Proved that electrons are place in definite orbit around the nucleus. -
Quantum Mechanical Model
a model that explains how electrons exist in atoms and how those electrons determine the chemical and physical properties of elements -
Albert Einstein
Came up with the equation E=mc2 which suggests that small particles of matter could be converted into huge amounts of energy. -
Lise Meitner
Meitner and her partner Hann discovered a new element, proctactinium, in 1917. -
Robert A. Millikan
He spent his time working on the hot-spark spectroscopy of elements, this then extended the ultraviolet spectrum far past the known limit of the time. -
Louis de Broglie
Discovered the wave theory of matter, won Nobel prize for this in 1929. -
Otto Hahn
He helped develop and organise the usage of Chlorine and Mustard Gas in warfare. Discovered Uranium Z. -
Erwin Shrodinger
Was the Father of a revolutionary wave equation for electron movements. -
Electron Cloud
Erwin Schrodinger, states that electrons stay outside the nucleus in a cloud -
Marie and Pierre Curie
Discovered the Curie Point which is a temperature level at which ferromagnetic substances loose their ferromagnetic behavior. They also discovered Curie’s Law which was the effect of temperature on paramagnetism. -
James Chadwick
He discovered the neutron and was given the Nobel Prize for this discovery. -
Glenn T Seaborg
Co-discovered plutonium, wrote the Anctinide Concept of Heavy Element Electronic structure which showed how the heavier elements fit into the Periodic Table which then showed their relationship with the other elements.
