Stable Lons quick check. Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?

Answer 1

To find the number of neutrons in an atom, you can subtract the atomic number from the atomic mass. The atomic number of potassium (K) is 19, and its approximate atomic mass is 39.

Number of neutrons = Atomic mass - Atomic number
Number of neutrons = 39 - 19 = 20

Therefore, potassium has approximately 20 neutrons.