Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?(1 point) Responses 20 20 39 39 58 58 19

Question

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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 ≈ 39

So,

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

Therefore, the correct answer is 20.