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OpenStudy (anonymous):

does anyone no On the periodic table, there are two numbers in the block for the element potassium, K: 19 and 39.098. What are these two numbers, and what do they represent?

OpenStudy (anonymous):

19 represent atomic number and 39.098 is atomic weight of potassium

OpenStudy (anonymous):

Z=19(atomic number) = number of "neutrons" A=39.098(mass number) = number of "neutrons+protons"

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