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First person to think of the atom.
Thought atom was solid sphere. -
Everything made up of fire, earth, air, and water
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Tiny pieces of mass swimming everywhere.
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Atomic Theory:
1) All matter is composed of atoms. True
2) Atoms cannot be made or destroyed. False
3) All atoms of the same element are identical. False
4) Different elements have different types of atoms. True
5) Chemical reactions occur when atoms are rearranged. True
6) Compounds are formed from atoms of different elements. True -
Helped discover radioactivity.
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Proved negatively charged particles. (Electrons)
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Measured charge and mass of an electron.
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Atom has a central positive nucleus surrounded by negative orbiting electrons
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Atoms are small positively charged nucleus surrounded by electrons traveling in circular orbit
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Isotopes of non-radioactive elements
212 natural atoms -
Nucleus and shells
Each shell contains subshells -
Discovered Neutron