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

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