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Democritus, a ancient greek philosopher was born in 460BC.
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Dalton was a chemist who believed all matter is made of atoms.
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Crooke was a physicist and chemist who worked on spectroscopy and discovered the tube.
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A Russian Chemist.
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A English chemist, one of the first to propound the conception of periodicity among the chemical elements.
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Discovered Cathode Rays.
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Crooke discovers new element Thallium.
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‘If the elements are arranged in order of their equivalents [ie relative atomic masses in today’s terminology] with a few transpositions, it will be seen that elements belonging to the same group appear in the same horizontal line. Also the numbers of similar elements differ by seven or multiples of seven. Members stand to each other in the same relation as the extremities of one or more octaves of music. T
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Hendeleev wrote his book on the principles of chemistry 1868-1870.
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a Physicist and one of the nucleus founders.
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Crooke discovers "Crookes Tube" in 1875.
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A Danish physicist.
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Niels Bohr applies quantum theory to Rutherford's atomic structure by assuming that electrons travel in stationary orbits defined by their angular momentum. This led to the calculation of possible energy levels for these orbits and the postulation that the emission of light occurs when an electron moves into a lower energy orbit.
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Greek philosopher/scientist, born in 384BC.
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Atoms are electrically neutral in nature. A large heavy mass is present in the centre of an atom that have protons and neutral subatomic particles. Electrons are revolves around the nucleus in the fixed circular path known as orbit. This discovered atomic theory was largely accepted and gives a complete explanation of structure of an atom.
