Question

Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?(1 point)%0D%0AResponses%0D%0A%0D%0A19%0D%0A19%0D%0A%0D%0A39%0D%0A39%0D%0A%0D%0A58%0D%0A58%0D%0A%0D%0A20

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 plugging in the values:

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

Therefore, potassium has 20 neutrons.