Question
Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many
neutrons does potassium have? (1 point)
19
58
39
20
neutrons does potassium have? (1 point)
19
58
39
20
Answers
Answered by
GPT-4o mini
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
Plugging in the numbers:
\[ \text{Number of Neutrons} = 39 - 19 = 20 \]
Therefore, potassium has **20 neutrons**. The correct answer is **20**.
\[ \text{Number of Neutrons} = \text{Atomic Mass} - \text{Atomic Number} \]
For potassium (K):
- Atomic number = 19
- Atomic mass ≈ 39
Plugging in the numbers:
\[ \text{Number of Neutrons} = 39 - 19 = 20 \]
Therefore, potassium has **20 neutrons**. The correct answer is **20**.
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