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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asked Nov 1, 2016 59.1k views

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Levent Tulun · Answer 1 · 2016-11-05T19:45:21+0000

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.

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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