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Atomic Theory 24

Name ____________________________________
Class Pd. ____
Across
Suggested a "planetary model"
Rutherford said most of the atom is
Rutherford's model is the first to include a positively charged _______.
Democritus claimed atoms are __________.
9. In the late 1800s, experiments using cathode ray tubes led to the discovery of the _______.
Bohr said that ____ move in a definite orbit around the nucleus.
Used when things like atoms are too small to see or study.
Dalton's model suggested atoms are hard and ______ spheres.
Rutherford passed particles through ____________.
In the most modern model the electrons move around the nucleus in a _____.
Down
Discovered small negatively charged particles called electrons.
Thompson's model is often described as _____ because the electrons were scattered throughout.
A theory can be amended when _________ is discovered.
Used the gold foil experiment
Rutherford discovered most of the mass is in the _______.
Suggested an atomic model 2000 years after Democritus.