How many electrons does a neutral atom of potassium (K) have?

A neutral atom of potassium has 19 electrons because the number of electrons in a neutral atom is equal to the number of protons. Potassium has an atomic number of 19, which means it has 19 protons in its nucleus. Since a neutral atom does not have an overall charge, it must also have the same number of electrons to balance the positive charge of the protons. Thus, the correct answer is that a neutral potassium atom contains 19 electrons, corresponding to its atomic number.