Potassium atomic number is 19 and that it's atomic mass is approximately 39 how many neutrons does potassium have
To find the number of neutrons in an atom of potassium, you subtract the atomic number from the atomic mass.
The atomic number of potassium is 19, which means it has 19 protons in its nucleus.
The atomic mass of potassium is approximately 39, which includes the sum of the protons and neutrons in the nucleus.
Thus, to find the number of neutrons, you can subtract the atomic number (19) from the atomic mass (39):
39 - 19 = 20
Therefore, potassium has 20 neutrons.