Hydrogen Like Atoms

If the 2nd excitation potential for a Hydrogen like atom in a simple is 108.9V . Then the series limit of the paschen series for this atom is:

If Hydrogen like atom, the principal quantum number(excited) is 6,then find number of spectral lines.

If the series limit of Lymen series for Hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom,then atomic number of this hydrogen like atom will be

The photon radiated from hydrogen corresponding to 2^(nd) of Lyman series is abosorbed by a hydrogen like atom 'X' in 2^(nd) excited state. As a result the hydrogen like atom 'X' makes a transition to n^(th) orbit. Then :

The photon radiated from hydrogen corresponding to the second line of Lyman series is absorbed by a hydrogen like atom X in the second excited state. Then, the hydrogen-like atom X makes a transition of nth orbit.

If atomic radius of third orbital of hydrogen like atom is R, then find the atomic radius of 4th orbital

If ((0.51xx10^(-10))/4) m is the radius of smallest electron orbit in hydrogen like atom, then this atom is.

The first excitation potential of a hypothetical hydrogen- like atom is 15 V . Find the third excitation potential of the atom.

If ((0.51times10^(-10))/4) meter is the radius of smallest electron orbit in hydrogen like atom,then this atom is