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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 nucleus
Electron 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 time
democitis made a theory of the atom
Niels 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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