The correct symbol for the isotope of potassium with 22 neutrons is: This will be written as X/Y with X being on the top next to the atom and Y being on the bottom, next to the atom
2) The atomic number of K is 19 (from the periodic table) and this is also the number of protons. The atomic mass of this particular isotope of K will be the number of neutrons (22) + the number of protons (19) = 41. By convention the atomic mass is written as a superscript on the left of the atomic symbol and the atomic number is written as a subscript on the left of the atomic symbol. (Answers 1 and 4 seem to be the same for some reason).
