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Thales of Miletus discovered static electricity.
Transcript of Thales of Miletus discovered static electricity.
Democritus discovered atoms in 400 BC and made the first atom model. He took a simple seashell and broke it in half. He then took that half and broke it in half over and over and over again until he was finally left with a powder. He took the smallest piece and tried to break that but could not.
Aristotle stated that "atoms don't exist" in 300BC. This went against the theory by Democritus.
John Dalton 1800's "atomic theory." He stated that all elements are composed of atoms, atoms are indestructible, and compounds are formed by joining atoms in specific whole number ratios.
Henry Becquerel discovered radioactivity in 1896. He exposed potassium uranyl sulfate to sunlight and then placed it on photographic plates, he believed that the uranium would absorb the sun’s energy and then emit it as x-rays. This hypothesis was disproved on the 26th-27th of February. Becquerel decided to develop his photographic plates anyways and the images were strong and clear.
JJ Thomson discovered electrons in 1897 or 1904. He measured the mass-to-charge ratio of the cathode rays by measuring how much they were deflected by a magnetic field and comparing this with the electric deflection. He used the same apparatus as in his previous experiment, but placed the discharge tube between the poles of a large electromagnet.
Marie Curie did lots of research in the early 1900s to help improve the worlds knowledge of radioactivity. She built off of JJ Thomson's discovery.
Rutherford discovered the nucleus in 1911. Rutherford shot alpha rays through gold foil and he hypothesized that the alpha rays particles would pass through the gold foil with little or no deflection. However when he did the experiment he saw that most of the alpha rays did pass right through but, some of the particles were deflected. This proved that the atom is made up of mainly empty space except for the nucleus in the middle.
Bohr created a atom model different than Rutherford's model in 1913. It shows the atom as a small, positivity charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
Chadwick discovered the neutron in the atom in 1932. He compared energies of particles ejected from various targets. Comparing them led to the discovery of neutrons.
The Manhattan Project was brought atomic bombs to the US. It was a research project that produced the first atomic bombs during WW2. The bombs were tested in 1945.
Oppenheimer did important research in theoretical astronomy, especially as related to general relativity and nuclear theory. Oppenheimer also made important contributions to the theory of cosmic ray showers and started work that eventually led to descriptions of quantum tunneling. This occurred in 1943.
By: Daulton McLendon
Einstein and Meitner both contributed to the discovery of fission. Meitner actually discovered it unknowingly. This happened in 1945.
Gell-Mann discovered quarks in 1964. They have a positive charge of 2/3 and down quarks obtain a charge of negative 1/3. The charge makes up the electrical charge of the nucleus. Protons contain two up quarks and one down quark.
Fermilab discovered the top quark in 1995. The top quark, which is as heavy as a gold atom but much smaller than a proton, was the last undiscovered quark of the six predicted to exist by current scientific theory.
Modern Electron Cloud Model was discovered or created in 2009. It is the most recent model and is a visual model that maps the possible locations of electrons in an atom. The model is used to describe the probable locations of electrons around the atomic nucleus.
The first iPhone was released in 2007.
Nintendo was founded in 1989.
First TV was invented in 1927.
First computer was invented in 1934.
First automobile was invited in 1886.
First Kmart opened in 1962.