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Atomic Structure Timeline
busy work? yeah.
Created by
Olivia Barry
⟶ Updated 7 months ago ⟶
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Events
Democritus develops theory that everything is made of atoms
Aristole believes in 4 elements instead of atoms; adds a fifth, aether.
Berzelius complied list of atomic weights
Avogadro develops hypothesis later named after him about gasses and their proportionality
Dalton introduces atomic theory
Mendeleev creates periodic table of elements
Thomson showed how different volumes of gasses react in different ways in his book Elements of Chemistry
Becquerel is the first person to discover evidence of radioactivity
Curie discovers two new radioactive elements; coins term "radioactivity"
Lavoisier develops oxygen theory of combustion
Rutherford develops his model of an atom, with a nucleus full of mass with low-mass electrons surrounding it
Moseley performs experiment and finds atomic number closely correspond to the nucleus's electrical charge atomic number
Chadwick discovers neutron
Milikan measures the elementary electric charge
Bohr discovers that electrons in the valence layer can transfer between atoms
Plank develops theory of quantum physics/energy quanta
Schrödinger helps develop the theory of quantum mechanics with his equation
Heisenberg gets Nobel Prize for "the creation of quantom mechanics"; matrix formulation
Meitner leads team of scientists to discover nuclear fission of uranium
