Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?(1 point)

Question

Responses

20
20

19
19

39
39

58
58

Answer 1

To find the number of neutrons in an atom, you can use the formula:

Number of neutrons = Atomic mass - Atomic number

For potassium:

• Atomic number = 19
• Atomic mass ≈ 39

Now, substituting the values into the formula:

Number of neutrons = 39 - 19 = 20

So, potassium has 20 neutrons.