-
335
Aristotle
*he came back to Athens with Alexnader Bel's (the great) approval in 335 and established his own school at the Lyceum, Spending most of the rest of his life engaging there in research, life, and teachings. -
Period: 400 to
500-1900 timeline
-
460
Democritus
Democritus is born in Abdera, Thrace, Greece. 460,BC
*his name represents "chosen of the people".
*he was an Ancient Greek philosopher.
*notable for: atomism... the distant star theory.
*his main intrests were: metaphysics, mathematics, and astronomy. -
Dalton, John
*Born in 1766-1844
*english chemist with a quacker background.
*was fasinated with the waether, which led him to research into natural gases, which became his atomis theory.
*kept daily records of the weather for 57 years.
*he made a mistake in assuming the simplest compound of two elements must be binary, formed from atoms of each element in a 1:1 ratio.
*his atomic weights were not very accurate either.
*although his theory was a little off, it provided a logical explination of concepts. -
Crookes
*Sir William Crookes,
*born in london, 1832-1919.
*invented " Crookes tube"
*HE DID NOT invent the vaccum tube with a cathode and anode to produce an electric current.
*he became intrested in Spectrmetry, and electrical discharges into near vaccums. -
Mendeleev, Dmitri
*born in siberia, 1834-1907
*he revolutionized our understanding of the properties of atoms, and created a table that is probably a peice of furniture that is in every classroom in the world. -
Newlands, John
*John Alexander Reina Newlands
*born in london, 1837-1898
* one of the first to propound the concept of the periodicity among the chemical elements. -
Law Of Octaves
John Newlands publishes his law of octaves. -
Periodic Table
*mendeleev began working on his great invention.
*known as the periodic table.
*he arragned the elements by knowing their atomic masses. all 63 elements.
*he put all the numbers that were closed together in groups, and left a gap in the table for new elements that were found after he died.
*those elements were: Gallium, Scandium, and Germanium. -
Crooke's Recognized
*that a green line on a spectrogram must be a new element.
*he isolated the element and named it "Thallium". -
Crooke's Tube
*Crookes invented a divice called "Crooke's Tube".
*consisted essentially of a sealed glass tube which nearly all the hair has been removed.
*the walls of the tube are passed by two electrodes.
*electrons are emitted from the cathode and are accelerated toward an anode.
*his tube was used by crooke's several times. -
Crooke's invented
*the Radiometer, and evacuated transparent bulb that has an arrangment of vanes.
*is black on one side and silver on the other.
*it spins when placed in the light, because it's unequal heating of the gases are left in the bulb near the black and silver vanes. -
Crooke's Tube was used
*and helped the discovery of x-rays by W.C. Roentgen, in 1895 -
Crooke's Tube was used
*by JJ Thomson, and helped the discovery of the electron. -
Rutherford, Ernest
*born in 1902, in New Zealand.
*used JJ Thomson's theory to discover his own.
*"Plum Pudding Model."
*his theory was that "most of the atom was made up of 'empty space'.
*he showed that many heavier elements like uranium, thorium, and radium all had been observed to emit a kind of radiation.
*urnanium and the others were not stable, they broke up, spotaniously, and formed other elements. -
Rutherfords Theory
*found the fantastic ower in the atom, the NUCLEUS. -
Bohr's Model
*Depicts the atom as a small, positively charged nucleus surrounded electrons that travel in circular orbits around the nucleus.
*also known as the "planetary Model".
*shows in an example, that it moves around the nucleus like the planets orbit around the sun. -
Bohr, Niels
*he won the nobel prize ina a physics contest. -
Thomson, Joseph John
*born in 1972.
*british physicist.
*had a major impact on theology in the last half of the 20th century.
*best known aas the exponent and developer of "the death of God".
*Discovered the electron in a series of experiments disigned to study the nature of electric discharge in a high-vaccum cathode-ray tube.
*which was what he used to discover it. -
Thomson
*as of 1997 Altizer had written eleven major books. -
Aristotle
*Aristotle was born in 384, BC.
*born in Stagira, Greece.
*he investigated- logic,philosophy,and ethics to physics, biology, psychology, politics, and rhetorics.
*was the most notable product of the educational program devised by Plato.
*DOESN'T belive in atoms, because its says that everything can be broken apart, but the atom cannot be.