How many protons, neutrons, and electrons does the atom 39-K have?

How many protons, neutrons, and electrons does the atom 39-K have?
Protons = atomic number
Electrons = protons (atomic number) if the atom is neutral
Neutrons = Mass number - Number of protons (atomic number)
K has a mass number of 39 as indicated in the question and atomic number of 19 from the Periodic table. Therefore, we get 19 protons, 19 electrons and 39-19 = 20 neutrons.


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