History of atoms Flashcards
Who proposed the solid sphere model of the atom?
John Dalton in 1803, stating that atoms of the same element are identical and invisible particles.
What is the plum pudding model?
Proposed by JJ Thompson in 1904, it describes negatively charged electrons in a positive sphere.
What did Ernest Rutherford discover?
The nuclear model in 1911
What was the gold foil experiment?
Fired alpha particles at a thin gold foil; most passed through but some deflected at large angles.
Who invented the planetary model of the atom?
Niels Bohr in 1914
What is the quantum model?
Proposed by Erwin Schrodinger, stating that electrons don’t have a fixed path and whiz around quickly like a cloud.
What did James Chadwick contribute to atomic theory?
The neutron theory, identifying uncharged particles found in the mass similar to a proton.
Who proposed the Quantum model?
Erwin Schrodinger
What was the planetary model?
Electrons orbit the nucleus at different energy levels (electron shells).
What is the nuclear model invented by Ernest Rutherford?
Atoms are mostly empty space
- contain positively charged nucleus.
What was JJ Thompson discovery?
Plum pudding model in 1904
Who stated that that atoms of the same element are identical and invisible particles
John Dalton
