-
Period: 300 to
Scientific Scienist Timeline
When scientific discoveries were discovered!!!! -
400
Democritus' Theory
Democritus said that atoms were made up of an indestructible and indivisible matter. And make up everything. -
Dalton's Atomic Theory
Dalton's 5 Theories:
1 All matter consists of tiny particles.
2Atoms are indestructible and unchanging.
3 Elements are characterized by the mass of their atoms.
4 When elements react, their atoms combine in simple, whole-number ratios
5 When elements react, their atoms simplify into more than one simple, whole number ratio. -
Mendeleev invents the Periodic Table
Dmitri Mendeleev arranges the Periodic table of elements by their properties. -
Thomson's discoveries
JJ Thomson discovers the electron in a series of many expiriments. -
John Newlands' Law of Octaves
John Newlands publishes and states 'The Law of Octaves' which states: “Any given element will exhibit analogues behavior to the eighth element following it in the table.” -
John Newlands
He is known for his work on the periodic table and ordering elements by their atomic weight. (He was the first to use that term) and in 1865 he published his “law of octaves” which states that “any given element will exhibit analogues behavior to the eighth element following it in the table“. Elements were arranged in 7 octaves like the musical octaves -
Rutherford's Discoveries
Becomes known as the father of Nuclear physics. Ernest Rutherford discovered the half life of radioactive elements and the Proton -
Invention of the Crookes Tube and radiometer
lliam Crookes invents the Radiometer and discovers the element "Thalium". -
Bohr's discovery!
Niels Bohr discovers that the electrons move around the nucleus in a fixed unit. -
Chadwick's Discovery
Discovered the Neutron. -
Aristotle's Theory
Aristotle had a method of investigation, defining the subject matter considering the difficulties involved by reviewing the generally accepted views on the subject, and suggestions of earlier writers presenting his own arguments and solutions
