Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?(1 point)
Responses
20
20
19
19
58
58
39
To find the number of neutrons, subtract the atomic number from the atomic mass.
Atomic mass: 39
Atomic number: 19
Number of neutrons = Atomic mass - Atomic number
Number of neutrons = 39 - 19
Number of neutrons = 20
Therefore, potassium has 20 neutrons.
To find the number of neutrons in an atom of an element, you can subtract the atomic number from the atomic mass.
For potassium, the atomic number is 19 and the atomic mass is approximately 39.
Therefore, the number of neutrons in potassium is approximately 20.
So the correct answer is 20.