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The Atomic Theory of Matter Timeline
Transcript of The Atomic Theory of Matter Timeline
The Stone, Copper, Bronze, and Iron Ages
-6th - 4th centuries.
-Philosophized whether matter could be divided freely, or if there was an ultimate ending point.
Transition Period and Industrial Age
Scientists of the 1700's
Scientists in the 1800's
2.5 Million years ago.
Ended from 6000 BC to 2500 BC for those living in Northern Africa and Eurasia.
AKA the Chalcolithic age.
Transition between the stone age and bronze age.
Occurred between 5000 and 7000 years ago.
Defined by the inability to smelt iron.
Smelted copper with tin to for bronze, an alloy.
Steel began to diffuse across Europe, Asia, and Africa.
The higher the carbon content, the harder the steel.
Believed matter could split infinitely.
Aristotle's four earthly elements: Air, fire, earth, water.
Plato and Aristotle
Considered to be the father of modern science.
Believed that matter was composed of small, indivisible particles called atomos.
17th and 18th centuries.
Alchemists discovered new elements/chemicals and methods to work with them.
18th to 19th century.
Manufacturing, mining, agriculture, transportation, and technology had a profound effect on the socioeconomic and cultural conditions of the time.
Nuclear technology as a form of energy.
The founder of modern chemistry.
Disproved the phologiston theory.
The law of conservation of mass.
Law of definite proportions, which states that a chemical compound always contains exactly the same proportion of elements by mass.
-Developed the atomic theory (1803-1807), which consisted of four postulates.
Pioneer of vacuum tubes.
Invented the Crookes cathode ray tube.
Sir William Crookes
Discovered X-rays and their use in medicine.
Wilhelm Conrad Roentgen
Discovered Polium and Radium in 1898.
Marie was the first woman to ever receive a Nobel prize.
Marie and Pierre Curie
Measured the ratio of the electrical charge tot he mass of the electron using a cathode ray tube.
Isolated three types of radiation: Alpha, beta, and gamma.
Deduced that most of the atom is empty space, surrounding a dense, central region of positive charge.
1909 at the University of Chicago.
Determined the charge of the electron by measuring the effect of an electric field on the rate at which charged oil fall under the influence of gravity.