The Atomic History Timeline

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Democritus he proposed that all mater including space and time was made up of small units named atoms

Dalton agreed that all matter was created by atoms which he believed were indestructible.

Mendeleev created the periodic table of elemets which organizes elements according to their similarities

Eugene G oldstein Discovered possitive particles

Henri Becqurel discovered radioactivity which earned him a nobel prize

J.J Thomson Discuvered the electron

Ernest Rutherford used the gold foil experiment to discover the modern of an atom

Millikan Used an oil rop experiment to etermine the charge of a single electron

Neils Bohr explained that outer orbits in an atom could hold more electrons than the inner orbits

frederick Soddy came up with the concept of isotopes

Heisenberg Thougt of the uncertainty proinciple

Chadwick discovered the neutron