Determine the number of protons, electrons, and neutrons present in an atom of patassium. Explain how you determined your answer using complete sentences. Please make sure your right.

Thank you!!!

Protons-19 because protons are equal to the atomic number which is 19 , electrons-19 electrons are equal to number of protons, neutrons-20 because the mass number of potassium is 39 so subtract 39 from 19 (atomic number) which gives us 20

Cr(oh)3 -> cr(3+) + 3oh-