How to find the Ionization energy of He+

[SWestad]

Ok so I'm using the equation E= (-Z^2 x Rh)/ n^2
RH is a constant of 2.178x10^-18

I determined that the second ionization energy of He is the ionization energy of He+.

If my math is right, the ionization energy is 8.712x10^-18... this is assuming n=1, as I've determined it from ground state... But it that the ionization energy of He+?

 

[granpa]

according to 'kalzium', a linux program which is basically a periodic table of the elements with all sorts of chemical data for each element, the experimentally determined ionization energies of helium (which you can look up for yourself on the internet) are:
24.587 ev
54.417 ev

obviously this isn't 'giving you the answer' since I doubt these will agree with your equation but they may give you a number to check your answer against. if your number is very different then its probably wrong. just use google to convert the units.

I would be floored if the 2 numbers are exactly the same.

 

[Blueshift5]

Your calculation is correct. The ionization energy of He+ is indeed 8.712x10^-18 J, assuming n=1. This means that it takes 8.712x10^-18 J of energy to remove the outermost electron from a He+ ion, resulting in a He2+ ion. The ionization energy can vary depending on the specific energy level and configuration of the atom or ion, but this is a good estimate for the first ionization energy of He+. Keep in mind that this is a theoretical calculation and may not perfectly match experimental values due to factors such as electron-electron interactions and electron shielding.