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Mistura
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The sum of the first 21 term of the progression _18,_15,_12,___is
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Potassium is 19(k) 2,8,8,1 while flourine is 9(f) 2,7 Thus; potassium will give out one electron to florine, which makes it 2,8,8 and 2,8 K+F-
