History, atoms

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Last updated 11:34 AM on 5/23/26
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6 Terms

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What is Atom

basic unit of matter + defining structure of element

2
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Democritus

  • key idea - matter = made of tiny indivislbe particle called atom

  • ✖ conduct experiment, had idea

3
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Dalton

Idea = Atoms

•❌ be subdivided

•of same element = identical

•of diff elements have different masses.

•combine to form compounds

4
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Atoms

mostly empty space

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nucleus

  • The centre of the atom.

contain proton + neutron

contain almost all atom total mass

6
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shells

outside of the nucleus

electrons: Negatively charged particles which orbit around nucleus