For a doubly ionised Li-atom
A. Angular momentum of an electron in 3rd orbit is `"3h"/(2pi)`
B. Energy of electron in 2nd excited state is -13.6 eV
C. Speed of electron in 3rd orbit is `c/137`, where c is speed of light
D. Kinetic energy of electron is 2nd excited state is half of the magnitude of the potential energy
