democritus
Published on Nov 23, 2015
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democritus
- Used philosophy, not science
- Atoms were indivisible & indestructible
- Everything is made up of atoms
john dalton
- All matter is made of atoms.
- Atoms were indivisible and indestructible
- All atoms of a given element are identical in mass and properties
- A compound is formed by a combination of two or more atoms
- A chemical reaction is a rearrangement of atoms
J.J. Thomson
- the existence of electrons in an atom
- atoms are not indivisible and can be seen
- atoms were spherical and had a postive charge
Ernest Rutherford
- has a small, dense, positively charged nucleus
- electrons move around the nucleus
- the atom was mostly empty space
neils bohr
- the electrons move around the nucleus
- atom is small
- has a postively charged nucleus
erwin schrodinger
- only certain electrons orbit around the nucleus
- The orbit nearest the nucleus has an energy of E1, the next orbit E2, etc.
- energy is absorbed when going higher on the orbit and lower
james chadwick
- he discovered the neutron in an atom
- established the atomic number for atoms
