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Atoms!

The discovery and parts of an atom

QuestionAnswer
Greeks-440B.C.discovered that... cut something in ½ over and over you will eventually get to a single particle that can not be cut
John Dalton–late 1700s discovered that... •all substances are made of atoms •Atoms can not be created, divided or destroyed •Atoms of the same element are exactly alike •Atoms join together to make new substances •Hard solid sphere
Thomson-late 1800s discovered that... •Cookie dough model •Atoms have parts •Electrons – negatively charges particles in all atoms
Rutherford–1911 dsicovered that... •Nucleus – tiny dense positively charged center of atom
Bohr–1913 discovered that... •Electrons move around nucleus in specific paths or energy levels
Modern Model–20th Century states... •Electron cloud •Electrons do not travel in definite paths & can not be predicted
Electron -Negatively charged particle -Extremely small -Almost weightless -Easily removed from atom -Located around the nucleus in the electron cloud
Neutron -No charge (neutral) -Same mass as proton -Located in the nucleus -Discovered by Rutherford
Proton -Positively charged -Mass almost 2000 times heavier than an electron -Located in the nucleus -Discovered by J.J. Thomson
Nucleus -Contains tightly packed equal numbers of protons and neutrons -Discovered by Rutherford
Created by: Tori K.
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