6. *) Multi-electron systems:
6.1 The X-ray photoelectron spectrum of an unknown element X shows
in his
Emission spectrum based on four clearly different kinetic
energies:
5.9 x 10-17 J; 2.53 x 10-18 J; 2.59 x 10-20 J, and 2.67 x 10-20
J
(Assume that the X-rays have enough energy to destroy each
To knock out an electron from an atom.)
i) Name all possible atoms in their electronic ground state that
a
could deliver such a spectrum.
ii) Calculate the binding energy of an electron in the 2p orbital
of element X, if
the X-rays used in this experiment have an energy of 2.68 · 10-16
J
own.
6.2 To ionize phosphorus, the following ionization energies are
required:
1. Ionization energy: 1011 kJ / mol
2. Ionization energy: 1903 kJ / mol
3. Ionization energy: 2912 kJ / mol
i) Use this information to calculate the effective nuclear charge
(Zeff), which is applied to the 3p
Electron works!
ii) What would you expect? Is the minimum energy needed to get a 3s
electron
to knock out of the phosphorus atom in a photoelectron experiment,
bigger,
less than or equal to the 4th ionization energy of the phosphorus
atom? Briefly explain your reasons
Answer!