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%0A58%0D%0A58%0D%0A%0D%0A39%0D%0A39%0D%0A%0D%0A20%0D%0A20%0D%0A%0D%0A19

Answer 1

To find the number of neutrons in potassium, you use the following formula:

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

For potassium, the atomic mass is approximately 39 and the atomic number is 19.

So:

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

Therefore, potassium has **20 neutrons**.