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Chapter 4: chemistry
atoms and neutrons
Question | Answer |
---|---|
early philosophers wondered about the ___________ ___________ of matter | fundamental nature |
what were the contrasting ideas? | it was infinitely divisible or only divisible until a fundamental unit was reached |
(400 bc) called nature's basic particle an atom, meaning 'indivisible' [believed it physically resembled the matter it made] | Democritus |
was much more influential and his opinion that matter could be infinitely divided prevailed for almost 200 years (combination of 4 elements) | Aristotle |
1800s proposed elements were composed of atoms and only whole numbers of atoms can combine and form compounds | Dalton |
1. atoms are divisible 2. an element can have atoms with different masses | modern atomic theory |
the discovery of ________ _______ disproved Dalton's "indivisible" atom | subatomic particles |