21. The energy levels for a Bohr atom are shown below. -0.54 ev n = 5 -0.85 eV n = 4 -1.51 eV n = 3 -3.40 eV n=2 -13.6 eV n=1 What amount of energy is needed for an electron to jump from n = 1 to n = 4? (h = 6.626 x 10 19, 1 ev = 1.6 x 10-19 J) 12.1 ev 128 eV 13.1 ev 10.2 ev