The Parts of an Atom.

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Presentation transcript:

The Parts of an Atom

J.J. Thomson He experimented with cathode ray tubes

He passed electricity through the tube and discovered the first subatomic particle – the electron He developed the plum pudding model of an atom

Plum Pudding Model

Robert Millikan He determined that the electron has a negative charge He determined the mass of the electron

Ernest Rutherford He proved the plum pudding model was incorrect with the gold foil experiment

Gold Foil Experiment positive alpha particles

He discovered the nucleus of the atom! The nucleus is the dense, positively charged center of the atom He came up with the Nuclear Atomic Model

Nuclear Atomic Model Nucleus Electron

Years later, Rutherford discovered the proton proton = a positively charged particle inside the nucleus + nucleus proton

James Chadwick worked with Rutherford discovered the neutron – a particle in the nucleus with the SAME MASS as a proton, but with NO charge (it’s neutral)!

Modern Atomic Structure spherically shaped most of atom’s mass is in the nucleus (99.7%) nucleus surrounded by negative electrons

Atoms have no charge (they are electrically neutral) because the number of protons is equal to the number of electrons 3 protons (+) 3 electrons (-) + -

*Electron has the least mass particle symbol location charge mass (g) relative mass electron e – in space around nucleus – 9.11 x 10 – 28 _1__ 1840 proton p+ inside + 1.673 x 10 – 24 1 neutron n0 no *Electron has the least mass

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