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In the 5th Century BCE, Democritus coined the term 'a-tomus', which means uncuttable
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In 1799, Dalton stated that elements combine in definite whole-number ratios.
At the same time, slavery was abolished in New York. -
In 1803, Dalton stated that atoms of the same element are identical. He also stated that all matter is made of atoms
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In 1869, Mendelev created the first periodic table of elements.
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In 1900, Planck stated that electrons absorb and emit discrete amounts of energy called quanta.
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In 1900, Soddy discovered isotopes.
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In 1910, Millikan used the oil drop experiment to discover the charge of the electron.
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In 1911, Rutherford used the gold foil experiment and discovered the nucleus of an atom. Also in 1911, Rutherford stated that atoms are mostly empty space except for the dense positively-charged nucleus.
At this time, the Mexican Revolution was going on. -
In 1912, Bohr stated that electrons travel in definite paths, called orbits.
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In 1913, Henry Moseley ordered the periodic table by atomic number, fixing his predecessor’s mistakes.
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In 1923, De Broglie proposed that electrons behave as light (energy) and particles (matter).
At this time, World War I was going on. -
In 1932 Chadwick discovered the neutron.
At the same time, the Great Depression occured. -
What a stud!
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Hes single and ready to mingle
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