history of the atom Flashcards
what’s the history of the atom in order
atomic model (1808)
plum-pudding model (1904)
nuclear model (1911)
gold foil experiment (1911)
planetary model (1913)
who thought of the atomic model?
John Dalton
who thought of the plum-pudding model?
Joseph John Thompson
who thought of the nuclear model?
Ernest Rutherford
who thought of the gold foil experiment?
Gieger and Mardsen
who thought of the planetary model?
Niels Bohr
what were Dalton’s theories about the atomic model?
everything is made of tiny spheres (atoms)
atoms are indivisible
all atoms of one element are identical in mass and properties
what were Thompson’s about the plum-pudding model?
atoms were positively charged matter with negative electrons embedded within it
atoms have no overall charge
what were theories of Rutherford’s about the nuclear model?
positively charged nucleus with negative electrons around the outside
(found this by firing alpha particles at a gold sheet of foil, most particles went straight through but some bounced back- showed that most of the atom was empty space)
what were theories of
