n = \(\alpha\) 0.06eV E=3 -1.6eV E=2 -3.7eV E=1 -5.5eV E=0 -10.4eV The energy levels in the mercury atom is illustrated in the table above. Calculate the ionisation energy of the atom.
A
+21.2eV
B
+10.4eV
C
-10.4eV
D
-21.2eV