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400
Democritus
Around 400 B.C. Democritus a Greek philosopher suggested that all things are "composed of minute, invisible, indestructable particles of pure matter which move about ertarnally in infinite empty." (Date unknown, only the year is right, 400 B.C.) -
John Dalton
Dalton, a british schoolmaster was able to say that atoms of different elements combine in whole number ratios. This theory, to go with four other theories, made up what Dalton called the "Modern Atomic Theory." (Date not actual, only the year is right) -
James Chadwick
James Chadwick was an English physicist who discovered the Neutron in 1832. He was awarded the Nobel Prize in physics in 1835 for his work. (Date not actual, only the year is right) -
Dmitri Mendeleev
Dmitri Mendeleev was a Russian chemist and inventor. He made the periodic table and was awarde the Nobel Prize in Chemistry for his work. (Date not actual, only the year is right.) -
J.J. Thompson
Thompson, a British physicist created a tube that had a positively charged anode on one side and a negatively charge cathode on the other side. Thompson then applied a magnet to the middle of the tube, equal distance from the cathode and anode, and discovered that negatively charged particles were emanating towards the positive magnetic field. (Date not actual, only the year is right) -
Ernest Rutherford
Ernest Rutherford was a British physicist. He did an experiment with alpha particles and gold foil. Most of the particles went through the foil. This proved atoms are mostly empty space. (Date not actual, only the year is right) -
Henry Moseley
Henry Moseley was an English physicist. He invented the first atomic battery. He discovered this when he was experimenting with B-particles.(Date not actual, only the year is right) -
Niels Bohr
Niels Bohr a Danish physicist made the "Bohr Theory of the Atom" which was the closest to the modern atomic thoery. It reemphasized the idea of electrons around the nucleus. (Date not actual, only the year is right) -
Erwin Schrodinger
Erwin Schrodinger an Austrian physicist who viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.(Date not actual, only the year is right)
