Scientist and their Contributions

Timeline created by fhschemistry
Event Date: Event Title: Event Description:
Timeline 460 Democritus is born Democritus, a ancient greek philosopher was born in 460BC.
Timeline Dalton was born Dalton was a chemist who believed all matter is made of atoms.
Timeline Crook was born Crooke was a physicist and chemist who worked on spectroscopy and discovered the tube.
Timeline Mendeleev was born A Russian Chemist.
Timeline John Newlands was born A English chemist, one of the first to propound the conception of periodicity among the chemical elements.
Timeline Thompson discovers Cathode Rays
Timeline JJ Thompson is born Discovered Cathode Rays.
Timeline Crooke discovers thallium Crooke discovers new element Thallium.
Timeline John Newland publishes his law of octaves. ‘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
Timeline Mendeleev wrote, "the Principles of Chemistry" Hendeleev wrote his book on the principles of chemistry 1868-1870.
Timeline Rutherford is born a Physicist and one of the nucleus founders.
Picture2 Crooke discovers tube Crooke discovers "Crookes Tube" in 1875.
Timeline Bohr was born A Danish physicist.
Timeline Niels Bohr:- Atomic Model 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.
Timeline Aristotle is born Greek philosopher/scientist, born in 384BC.
Timeline Rutherford discovers the nucleus 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.
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