CHEM 131 Lecture Notes - Lecture 1: Hydrogen Peroxide, Ab4, Deuterium
27 Nov 2017
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One sample produces 25. 6g of o and 9. 6 g of carbon and the other same produces 21. 6 g of o and 8. 1 g of carbon. Thomson found a ratio between: millikan oil drop experiment charge and mass (for a given amount of mass there was a given charge, - 1. 76 x. Some particles through the foil, while others got reflected came straight back to the emitter concentrated positive charge in the middle of the atom. Positively charged nucleus surrounded by negatively charged electrons: equal number of protons and electrons. Big discovery: hydrogen 1 proton, helium 2 proton, helium is 4x hydrogen, chadwick experiment. If an element becomes charged, the amount of electrons changes: atoms have fixed numbers of protons, neutrons and electrons, elements can have different masses, isotopes. Isotopes have the same number of protons and electrons, but a different number of neutrons: ex: hydrogen- 0 neutrons.
