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First peron to think of the atom.
Thought atom was a solid circle. -
Everything is made from four elements. Fire, Air, Earth, and Water.
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Tiny pieces of mass "swam" around.
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Atomic Theory.
1. All matter is composed of atoms. true
2.Atoms can not be destroyed. false
3. All atoms of the same elements are identical. false
4. Different elements have different types of atoms. true
5.Chemical reactions occur when atoms are rearanged. true
6. Compounds are formed from atoms of different elements. true -
Radio activity.
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Proved the exsitence of negatively charged atoms.
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Measured Charge of single electron.
Measured mass of electrons. -
Atoms have a central positively charged nucleus surrounded by negatively charged obiting electron.
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Bohr Model- Electron travel in a circular orbit
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Isotopes non-radioactive
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Atom has a nucleus shell formula
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discovered Nuetron