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Scientists understood that opposites attract and the current, which bent toward the positive end, must be composed of negatively charged "things" (we later call them electrons). Following their observations, Thompson introduced the "Plum Pudding" model as shown below where the atom is just a positive sphere with negatively charged particles residing inside.These cathode rays originate at a negative cathode and proceed towards a positive cathode.However, once the scientists introduced a magnet to the setting, they noticed these rays did not travel in straight lines.Each atom has a given atomic number (Z), mass number (A), and atomic symbol (X) as shown below. Ex) Carbon: Z=6 because it has 6 protons in the nucleus ii. It is oversimplifying only a little to say that this number is the number of protons plus the average number of neutrons in that element. The number of neutrons in the nucleus of an element can be different, though. Carbon 12 has six protons (naturally, otherwise it wouldn't be carbon) and six neutrons. This carbon 14 when taken into plants as CO2 will also be taken into animals.The importance of these numbers cannot be understated and one must understand how to calculate them. Ex) Oxygen Z=8 because it has 8 protons in the nucleus c. The number is called the atomic weight or atomic mass. We can find out how much carbon 14 that normally is in a living plant or animal and from there we can find the actual amount of carbon 14 left in a plant or animal long dead.




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