Molecular Orbitals of a Period 2 Diatomic Ion
For the O2+ ion predict
(a) number of unpaired electrons,
(b) bond order,
(c) bond enthalpy and bond length.
Predict the magnetic properties and bond orders of
(a) the peroxide ion, O22 - , (b) the acetylide ion, C2 2 -.
Periodic Properties of the Elements Effective Nuclear Charge, Z* = number of protons in the nucleas- the shielding constant o A measure of the positive nuclear charge felt by an electron in the presence of other electrons o Z is the # of protons in the nucleus o Sigma is the shielding or screening constant, a measure of how much the electrons in the same or lower shells "protect" the electron from the nuclear charge o No screening by N+1 and higher level electrons o Screening by n level electrons < n-1 level electrons o Greatest screening by n-2 and lower level electrons o In front shield, in back don't shield at all o Within a family(vertical column) on the