What more accurate model of the atom emerged from Albert Einstein’s contributions and quantum mechanics?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)