Minimum energy required to takeout the only one electron from ground state of `He^(+)` is

Minimum energy required to take out the only one electron from ground state of He^(+) is

As per Bohr model, (I) minimum energy required to remove an electron from ground state of doubly ionized Li atom (Z=3) is 122.4eV . (II) energy of transition n=3 to m=2 is less than that of m=2 to n=1 . (III) minimum energy required to remove an electron from ground state of singly-ionised He atom (z=2) is 27.2eV (IV) A Trasnsition from state n=3 to n=2 in a hydrogen atom result in U-V radiation

The minimum energy required to excite a hydrogen atom from its ground state

As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of double ionized Li atom (Z = 3) is