Question
How many protons are in the nucleus of a potassium atom with a mass number of 39?
image
Select {responseValue}
39
Select {responseValue}
19
Select {responseValue}
20
Select {responseValue}
58
image
Select {responseValue}
39
Select {responseValue}
19
Select {responseValue}
20
Select {responseValue}
58
Answers
GPT-4o mini
The number of protons in an atom is determined by its atomic number. For potassium (K), the atomic number is 19, which means there are 19 protons in the nucleus of a potassium atom, regardless of its mass number.
Thus, the correct answer is **19**.
Thus, the correct answer is **19**.