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Chapter four

Democritus called nature's basic particle an atom, meaning indivisible. It physically resembled the matter it made (furry atoms)
Aristotle was much more influential and his opinion that matter could be infinitely divided prevailed for almost 2000 years: all matter was made of some combinations of 4 elements (earth, water, fire, air)
Aristotle and Democritus was a only a theory because... there was no scientific testing; only opinions.
Dalton's Atomic Theory John Dalton proposed that the elements were composed of atoms and only whole numbers of atoms can combine and form compounds
Modern Atomic theory was a modification of Dalton's theory. stated that atoms are divisible and an element can have atoms with different masses
Dalton's Theory ideas 1. element are composed of tiny indivisible particles called atoms 2. atoms of the same element are identical. Atoms of different elements are different. no dip.
Dalton's ideas con't 3. different elements can physically mix together or combine. they can combine in whole-number ratio 4. chem. reactions occur when atoms separate, join, rearranged in a different combination
Created by: anegrich14



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