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JOHN DALTON
English, 1766-1844 Chemist,
meteorologist and physicist
Careful study of Red – green color blindness
Atomic theory, gas law, atomic weight
SHORTCOMINGS OF DALTON’S ATOMIC
MODEL
the discovery of nuclear fission and fusion
Isotopes Atoms are not empty, there are empty
spaces in atoms.
WHY DID PEOPLE BELIEVE DALTON?
He had EVIDENCE! Dalton found that compounds always
contained the same mass ratio of one element to another
This is now known as the “Law of Definite Proportions” Elements could combine in different ratios, but when they did, they would
make different compounds. This is now known as the “Law of
Multiple Proportions”
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