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In 1627, Robert Boyle was born in Lismore Castle, son to The Great Earl of Cork, Richard Boyle. He was taken out of school at 11 and tutored. By 1655 he moved to Oxford and joined the Invisable College. Robert Hooke was employed around this time who went on to help Boyle with his experiments. Together they built the air-pump which became a common use in their experiments

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Atomic Theory#Robert Boyle#2 (Robert Boyle element & Atomic idea (Theory))

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On the 6th of September 1766 he was born in Eaglesfield in England.At 27 he was appointed teacher of Mathemathics and natural philosophy at the 'Manchester Academy' .Dalton carried out investigations about atomic theory. His main points were ,Elements are made of extremely small particles called atoms . Atoms of a given element are identical in size, mass and other properties . Atoms cannot be subsidized ,created,and destroyed . In Chemical reactions atoms are combined , separated and rearranged.

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Born in 1778, he has been in the science field since a young age as he apprenticed to a surgeon at age 19 before going to Bristol to continue his study of science.
He is responsible for creating and inhaling nitrous oxide, also commonly known as laughing gas' in order to test his theory that it caused diseases. However, this nearly killed him after inhaling water gas, a mix of hydrogen and carbon monoxide, which is sometimes used as fuel.

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He was born in December 13th 1780. He was best known for work that foreshadowed the periodic law for the chemical elements elements and he was known for inventing the first lighter , which was known as the Dobereiner's lamp . He became a professor of Chemistry and pharmacy

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Born in 1832. He's known for his discovery of thallium. He studied in the Royal College of Chemistry in London and after inheriting a large sum from his father he devoted himself completely to scientific research in his private lab.
He worked on his thallium theory from 1961 to 1973, when he declared its atomic weight, he spent a lot of that period studying its properties.

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He was born on November 26th 1837. John Newlands was the first to arrange the elements into a periodic table increasing order of atomic masses . He found that every eight elements and similar properties and called this the law of octaves

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Sir William Crookes: British Chemist and Physicist

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Born in 1834, Russian chemist-Dmitri Mendeleev, discovered that if you put all the discovered and known elements in order of increasing atomic weight that a recurring pattern appeared

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Joeseph John Thompson was a British physicist who was born on the 18th of December 1856. In 1897 Thompson was the first to suggest that Subatomic particles were 1000 times smaller than a normal Atom, these particles were then given the name Electrons.

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Robert Millikan was born on the 22nd of March 1868. In 1909 Millikan began a series of experiments to determine the electric charge carried by a single electron. One experiment was called the (Oil-Drop Experiment) in which he replaced water with oil. He measured the electric voltage between two metal plates as an oil drop fell between until the oil stopped falling.

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Ernest Rutherford was born on the 30th of August 1871 in Brightwater, New Zealand. Rutherford discovered the concept of the radioactive element Radon. Earnest Rutherford made the new atomic theory while using the theory that J.J Thompson made. Rutherford's theory better explained the model of the atom. He discovered that the positive charge of protons and neutrons and that a major mass was located in a small volume. He named this area the Nucleus.

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Neils Henrik David Bohr was born on the 7th of October 1885. Bohr developed the Bohr model of the atom, in which he described that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level to another.

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Henry Gwyn Jeffreys Moseley was born on the 23rd of November 1887. Moseley's periodic table is the modern form of the periodic table that is used today. Henry discovered the atomic number of each element using x-rays. Henry collected the x-ray spectra of a variety of elements and found that the frequency of x-ray radiation has a precise mathematical relationship to an elements atomic number. This relationship is now called Moseley's Law.

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James Chadwick was born on the 20th of October 1891. He was awarded the 1935 Nobel prize for his discovery of the neutron. Chadwick discovered that here was a new type of nuclear particle, one which had a detachable mass but no charge, he proved the existence of a neutral particle, it was called then the neutron.

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Moseley’s Law Definition | Physics Animation

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Newland's Law of Octaves | School Of Elements | Part 3

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The genius of Mendeleev's periodic table - Lou Serico

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JJ thomson and his discovery of the electron