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Created byShawn Sumter
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Les événements
John Dalton
1. Atoms are tiny, invisible particles.
2. Atoms of one element are all the same.
3. Atoms of different elements are different.
4. Compounds form by combining atoms.JJ Thomsom
Atoms are made mostly out of (+)
charged material, like dough in a bun.
The (-) charged electrons are
found inside the (+) dough.James Chadwick
Chadwick discovered neutrons.
He called these
particles neutrons.
Working with Rutherford, he
discovered particles with no charge.
Neutrons are also
found in the nucleusElectron clout
The new atomic model has electrons moving around the nucleus in a cloud. It is impossible to know where an electron is at any given timePériodes
democitis made a theory of the atomNiels Bohr
Niels Bohr improved on Rutherford’s model.
Every atom has a
specific number of
electron shells.Rutherford
Rutherford discovered protons and the nucleus.
He showed that atoms have (+) particles in
the center, and are mostly empty space.
He called these (+)
particles protons.
He called the center
of atoms the nucleus
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