Timeline small square

Scientist and their Contributions

Timeline created by fhschemistry
Event Date: Event Title: Event Description:
Timeline small square 19th Oct, 0460 Democritus is born Democritus, a ancient greek philosopher was born in 460BC.
Timeline small square Dalton was born Dalton was a chemist who believed all matter is made of atoms.
Timeline small square Crook was born Crooke was a physicist and chemist who worked on spectroscopy and discovered the tube.
Timeline small square Mendeleev was born A Russian Chemist.
Timeline small square John Newlands was born A English chemist, one of the first to propound the conception of periodicity among the chemical elements.
Timeline small square Thompson discovers Cathode Rays
Timeline small square JJ Thompson is born Discovered Cathode Rays.
Timeline small square Crooke discovers thallium Crooke discovers new element Thallium.
Timeline small square 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 small square Mendeleev wrote, "the Principles of Chemistry" Hendeleev wrote his book on the principles of chemistry 1868-1870.
Timeline small square Rutherford is born a Physicist and one of the nucleus founders.
Picture2 small square Crooke discovers tube Crooke discovers "Crookes Tube" in 1875.
Timeline small square Bohr was born A Danish physicist.
Timeline small square 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 small square Aristotle is born Greek philosopher/scientist, born in 384BC.
Timeline small square 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.
Timespan Dates: Timespan Title: Timespan Description:
1st Jan, 0460
to
460BC-1900
19th Oct, 0460
to
460BC-1900