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What is the total number of protons in the nucleus of an atom of potassium-42? (1) 15 (3) 39 (2) 19 (4) 42
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What is the total number of protons in the nucleus of an atom of potassium-42?

(1) 15 (3) 39
(2) 19 (4) 42

User AMarCruz
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The answer is (2) 19. The number of protons of any isotope of a given element is just its atomic number (because the number of protons identifies the element). Potassium's atomic number is 19.
User Levent Tulun
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