The NO molecule has a doubly degenerate excited electronic level \(121.1 \mathrm{~cm}^{-1}\) above the doubly degenerate electronic ground term. Calculate and plot the electronic partition function of NO from T=0 to 1000 K. Evaluate
(a) the populations of the levels and
(b) the mean electronic energy at 300 K.
Text Transcription:
121.1 cm^-1
CHAPTER 8. Periodic Relationships Among Elements Looking at Periodic Table o Ground-state electron configuration: ns1 , ns2 , 2 1 ns np , …etc. o Classification: G1, G2, G13-G17: Representative elements Transition metals Last transition metal group: Zinc, Cadmium, Mercury Noble Gases Lanthanides & Actinides o Atoms gain or lose electrons to have a noble-gas outer electron configuration 1 +¿ Na: [Ne]3 s = Na¿ : [Ne] 2 2+¿ Ca: [AR] 4s = Ca¿ : [Ar] o Cations & Anions of Representative Elements G1: +1 G2: +2 G13: +3 G15: -3 G16: -2 G17: -1 Isoelectronic: having the same number of electrons, hence the same ground-state electron configuration When a cation is formed from an atom of a transition metal, electrons are always removed first from the ns orbital & then from the (n-1)d orbitals 2 6 o Fe: [Ar] 4s 3d 2+¿ 0 6 5 o Fe¿ : [Ar] 4s 3d or [Ar] 3d Z effective nuclear charge ( eff): the “positive charge” felt by an electron
