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

Question

Responses

19
19

20
20

58
58

39

Answer 1

To find 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 number = 19
• Atomic mass (approximately) = 39

So, the calculation would be:

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

Therefore, potassium has 20 neutrons. The correct response is:

20