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Born in 460 BCE and died in 370 BCE. He theorized that all material bodies were made up of indivisibly small atoms and came to this discovery around 400 BCE.
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Greek/Sparta declare war on Persia.
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Born in 1766 and died in 1844. He came up with the Atomic Theory in 1803, which consisted of 2 things. Everything was made up of small particles called atoms. All atoms of the same element are the same and different elements have different atoms. -
The U.S. went through with the Louisiana Purchase.
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Born in 1791 and died in 1867. He discovered that atoms had an electric component in 1833. He called it the laws of electrolysis.
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Born in 1850 and died in 1930. He discovered the proton in 1886. This updated the model of an atom by adding protons.
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Born in 1856 and died in 1940, Discovered the electron in 1897. This updated the model by adding electrons. -
Greco-Turkish War begins.
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Born in 1868 and died in 1953. He discovered that electrons hold the same amount of negative charge.
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The Titanic sank.
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Born in 1885 and died in 1962. Niels Bohr discovered a model of an atom that completely changed how people perceived it. He depicted it as a “solar system, " showing how electrons could only occupy a certain orbit around a nucleus. -
The League of Nations was created in 1920.
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Born in 1901 and died in 1976. He discovered that there was a strong force within an atom’s nucleus. It’s what holds the protons and neutrons together.
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Born in 1887-1961. He perceived that electrons were waves and had certain orbital places where they could be found. -
Born in 1871 and died in 1937. He discovered the neutron in 1932. The neutron was added to the model of an atom. He also created a new model of the atom that is widely known. -
The U.S presidential election. Franklin D. Roosevelt was elected into office.
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Born in 1891 and died in 1974. He discovered the neutron. A neutron is the neutral component of an atom. and was added to the atomic model.