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John dalton made his discovery of the atom in 1803 .When experiments with gases became possible in the turn of the nineteenth century it led John to propose a modern theory of the atom based on the following assumption.1.matter is made up of atoms that are indivisible and indestructible.

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William Crookes is renowned today for discovering thaillium.He is today reconigised as one of the great scienctists of the Victorian era.He accidentally found the toxic heavy metal by burning the dust from a sulfric acid industrial plant.He named the new element 'thaillium' after thallos meaning young shoot.

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JjThomson announced his discovery that atoms were made up of smaller components on april 30 1897.He first investigated the magnetic deflection of cathode rays.

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1. He won the nobel peace prise for chemistry in 1907.
2. He was fasinated by spiritualism and often tried to find ghosts.
3. He was aged 87 when he died.
4. His brother died aged 21 from yellow fever.

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Ernest rutherford made his discovery of the atom in 1911.He discovered the nucleus of the atom.He discovered that radioactive prepertions gave rise to formation of gases.His model proposed that the negatively charged electrons surround the nucleus of the atom.He discovered alpha and beta rays and proposed the law of radioactive decay.He won the nobel peace prize for chemistry in 1908.

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Doberiener was a German scientist that is known for making vinegar, but he is best known for directing attention to the fact that the atomic weight of strontium is the mean of those of calcium and barium.

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Doberiener was a German scientist that is known for making vinegar, but he is best known for directing attention to the fact that the atomic weight of strontium is the mean of those of calcium and barium.

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Mendeelev was a Russian scientist created the symbols for the chemical elements,putting them in order according to their atomic weights and he invented the periodic table.

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Mendeelev was a Russian scientist created the symbols for the chemical elements,putting them in order according to their atomic weights and he invented the periodic table.

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john was the first to arrange the elements into a periodic table with increasing order of atomic masses.He discovered that every 8 elements had similarities and called this the law of octaves.Newlands discovered 56 elements.

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john was the first to arrange the elements into a periodic table with increasing order of atomic masses.He discovered that every 8 elements had similarities and called this the law of octaves.Newlands discovered 56 elements.

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Dmitri Mendeleev | Biography | Chemist, Inventor

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When creating the periodic table he left gaps for elements that were yet to be discovered 

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When creating the periodic table he left gaps for elements that were yet to be discovered 

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Chadwick discovered and proved that the existence of neutrons.

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Chadwick discovered and proved that the existence of neutrons.

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He studied at the University of Manchester. He worked under Ernest Rutherford and earned a master's degree in 1913

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He studied at the University of Manchester. He worked under Ernest Rutherford and earned a master's degree in 1913

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During World War 1 broke out, he was imprisoned in a camp for civilians at Ruhleben. He spent the entire war there.

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During World War 1 broke out, he was imprisoned in a camp for civilians at Ruhleben. He spent the entire war there.

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His famous oil drop experiment measured the fundamental unit of electric charge.He was a professer in the university of chicago.He died 19th december 1953.He discovered elementary charge.He won 5 awards.Education in columbia.

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His famous oil drop experiment measured the fundamental unit of electric charge.He was a professer in the university of chicago.He died 19th december 1953.He discovered elementary charge.He won 5 awards.Education in columbia.

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Video of Millikan's Oil Drop Experiment Transcript coming... Video from: http://www.chemtopics.com/unit04/munit4.htm

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Boyle was a 17th century chemist, philosopher and writer. He discovered that the volume of a gas decreases with increasing pressure and vice versa.

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Boyle was a 17th century chemist, philosopher and writer. He discovered that the volume of a gas decreases with increasing pressure and vice versa.

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Mosely was an English physicist and he invented X-ray spectrum analysis. He was also the first man who proved that every chemical element is determined by the number of protons it has rather than by its mass.

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Mosely was an English physicist and he invented X-ray spectrum analysis. He was also the first man who proved that every chemical element is determined by the number of protons it has rather than by its mass.

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Sir Humphry Davy was an English chemist. Davy discovered potassium. In 1808 he isolated the elements sodium, barium, strontium, calcium, and magnesium.

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Sir Humphry Davy was an English chemist. Davy discovered potassium. In 1808 he isolated the elements sodium, barium, strontium, calcium, and magnesium.

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He is also supposedly to have been the first to discover clathrate hydrates in his lab. 

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He is also supposedly to have been the first to discover clathrate hydrates in his lab. 

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On january 26th 1939 during the Fifth Washington Conference on Theoretical Physics at the George Washington University, Nobel Laureate Niels Bohr publicly announced the splitting of the uranium atom.Niels Bohr used information from Ernest Rutherford's description of the nucleus of the atom and Max Planck's theory of quantum theory. Bohr then discovered his idea of the atom's structure and how electrons travel in specific orbits.