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19 December, 09:24

23. On the periodic table, there are two numbers in the block for the element potassium, K: 19 and 39.098. What are the names of the numbers and what do they measure?

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  1. 19 December, 09:43
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    Atomic number (19) measures how many protons it has

    mass number (39.098) average of all the isotopes for potassium. as well as the number of protons + neutrons
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