Potassium's atomic number is 19, and its atomic mass is

Question

approximately 39. How many neutrons does potassium
have? (1 point)
19
39
58
20

Answer 1

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

\[ \text{Number of Neutrons} = \text{Atomic Mass} - \text{Atomic Number} \]

For potassium (K):

• Atomic Mass ≈ 39
• Atomic Number = 19

Now, substitute the values into the formula:

\[ \text{Number of Neutrons} = 39 - 19 = 20 \]

Therefore, potassium has 20 neutrons.