posted by mysterychicken .
41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons.
This is what I got-
I assume you means a "neutral" and not neutron atom .....
Your are right. Protons 19, neutrons 20. If the atom is neutral, and protons are +1 charged and electrons -1 charged, would electrons be the same as protons. That is ALWAYS true for neutral atoms.