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Q:

How many neutrons protons and electrons does potassium have.?

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has 20 neutrons and 19 protons (atomic number = number of protons) (number of neutrons = atomic mass - atomic number) atomic number = 19 atomic mass = 39 - 19 = 20 more
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Use the Periodic Table to get Atomic number (19), and atomic mass (39.1). The atomic number is the number of protons, and in the neutral atom, also the number of electrons: 19. The atomic mass is the sum of the mass of the protons and neutrons, 39.1. Subtract the number of protons (use integers) from the atomic mass, 39 - 19 = 20, which is the number of neutrons. more
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