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Sep 30, 1000
Democritus
He was first to believe matter was made up of tiny individual particles called atomos(490 B.C.) -
Sep 30, 1001
Aristotle
Rejected the atomic theory entirely because it did not agree with his own ideas on nature(390 B.C.) -
Antonie Lavosier
Compiled a list of 23 elements(1790) -
Joseph Proust
Found the law of constant composition(1799) -
John Dalton
Revived Democritus ideas based upon the results of scientific research he conducted(1800) -
Amadeo Avagadro
Determined the volume of one mole of gas(1811) -
Henri Becquerel
Discovered that phosphorescent uranium salts even when not exposed to light produced spontaneous emissions(1862) -
William Crookes
Discovered the cathode ray(1875) -
JJ Thomson
He had identified the first subatomic particle called the electron(1897) -
Marie Curie
Discovered Polonium(1898) -
Spanish-American War
In 1898 and lasted a little over 3 months and was located in Cuba, Puerto Rico, Philippines, and Guam
https://www.youtube.com/watch?v=q1goSNElCyE -
Philippine-American War
Lasted from 1899 to 1902 and was located in the Philippines
https://www.youtube.com/watch?v=1SEVAccFZSU -
Max Planck
Matter can gain or lose energy only in small amounts called quanta(1900) -
Flashlight
Invented in 1902 by Conrad Hubert -
Airplane
Wright brothers flew the first plane in 1903
https://www.youtube.com/watch?v=T5o-fhBKf8Y -
Crayons
Edward Binney and Harold Smith invented them by combining paraffin wax and color pigments and created Crayola Crayons in 1903 -
Robert Millikan
Determined the charge of an electron(1905) -
Albert Einstein
Calculated that a photon’s energy depends on its frequency(1905) -
Ernest Rutherford
He found the nucleus(1911) -
Henry Moseley
Each nucleus has a positive charge(1912) -
Niels Bohr
The hydrogen atom atom has only certain allowable energy states(1913) -
Lincoln Logs
Invented in 1916 by John Lloyd Wright
https://www.youtube.com/watch?v=a4V9dgV-Jic -
Band-Aid
Earle Dickson invented the first easy band-aid in 1920
https://www.youtube.com/watch?v=opjHfQ3GtwA -
Masking Tape
Richard G. Drew created masking tape for painters in 1923 -
Erwin Schrodinger
Derived an equations that treated the hydrogen atom’s electron as a wave(1926) -
Louis deBroglie
Saw that only whole numbers of wavelengths are allowed in a circular orbit or fixed radius(1926) -
Bread Slicer
First automatic bread slicer invented by Otto Frederick Rohwedder in 1927 -
Kool-Aid
Invented in 1927 by Edwin Perkins and changed the name from “Fruit Smack” to “Kool-Aid” and sold it in powdered packets -
Werner Heisenberg
Concluded that it is impossible to make any measurement on an object disturbing the object(1930) -
James Chadwick
Found that the nucleus also has a neutral particle called the neutron(1932)
