Ionization Energy: Finding with Charge & Electron Level

[Twigs]

How can you find the Ionization Energy if given the charge and electron level?

 

[dextercioby]

In general,ionization energies are tabulated and are given only for the last shell electrons.By charge i think u might mean Z and electron level,the orbital containing the electron which would get expelled.

So,there's no general formula,just experimental values.

Daniel.

 

[Galileo]

How can you find the Ionization Energy if given the charge and electron level?

It kinda depends on the state of the atom. The ionization energy would be the energy required to remove an electron from the atom and thus ionizing it.
For example, the ionization energy of Helium (in the groundstate) is the difference in energy between it's groundstate and the groundstate of He+.

 

[dextercioby]

Tabulated values are for ground state electrons only.

Daniel.

 

[SpaceTiger]

How can you find the Ionization Energy if given the charge and electron level?

It's certainly true that for atoms with many electrons, you're best off going to a table for these things, but there are formulae for simple atoms and approximations for states that aren't tabulated. For example, hydrogen-like ions (i.e. with one electron) follow:

$$E \simeq 13.6\frac{Z^2}{n^2}~eV$$

High-Z two-electron atoms can be approximated with a similar formula:

$$E \simeq 13.6\frac{(Z-1)^2}{n^2}~eV$$

There are many analytical/numerical approximations to the energy levels of more complicated atoms, so perhaps you can be more specific about what you're looking for.

 

[Troy]

$$Z^2_eff$$ tttttt