Question

How many electrons are in a neutral potassium atom with a mass number of 39?

image

Select {responseValue}
39

Select {responseValue}
19

Select {responseValue}
20

Select {responseValue}
58

Answer 1

A neutral potassium atom has the same number of electrons as it has protons. The atomic number of potassium (K) is 19, which means it has 19 protons. Therefore, a neutral potassium atom also has 19 electrons.

So, the correct answer is **19**.