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WHS CHEM.I HISTORY

Carmen R.

WHS CHEM.I HISTORY

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Across
1.Credited with the discovery of the neutron
6.Discovered canal rays which are positive
9.Credited with the discovery of the electron and the 'plum pudding' model of the atom
10.Frist to suggest the idea of atoms
Down
2.determines the number of protons in an atom (2 Words)
3.the metal electrode in the cathode ray that is negative
4.metal electrode in the cathode ray that is positive
5.Proved the existence of neutrons with the now famous "gold foil" experiment, as well showing that most of an atom is empty space
7.Credited with the development of an early atomic theory
8.Credited with the "planetary" model of the atom that shows electrons orbiting the nucleus

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