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Q: A chlorine atom that has 17 protons and 18 neutrons is called A. chlorine-17. B. chlorine-18. C. chlorine-35. D. chlorine-1.
A: All Chlorine atoms have 17 protons. However, ISOTOPES exist, which are atoms with varying numbers of neutrons. [ (A Chlorine atom with 17 neutrons would not be considered an isotope, because it has the same number of neutrons as protons) It is impossible to tell how many neutrons a particular atom has, (unless you have some really high tech equipment to work with) so for the sake of
chemistry, we sample a bunch of atoms of a given element (Chlorine, in this case) and take the average number of neutrons. We add that decimal to the number of protons that the element ALWAYS has, and end up with the average atomic number. On the periodic table, the average atomic number is listed underneath the Cl symbol as 35.45. This means that the average Cl atom has 17 protons and just over 18 neutrons (17 + 18 = 35). SO, the best answer to your question is "An isotope of Chlorine has 17 protons and 18 neutrons." Read more: ]
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Asked 11/3/2012 10:21:49 AM
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