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Chapter 11 science Intro to atoms

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Development of the atomic theory
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Democritus
Greek philosopher who first coined term "atoms" indivisible
Aristotle
Another Greek philosopher disagreed and Democritus' ideas were ignored for centuries
Nucleus
Inside an atom there is a nucleus.
Protons
Protons are positively charged.
Neutrons
Neutrons are neutral charged.
Electrons
Electrons are negatively charged.
The atomic number
The number of protons in the nucleus