Question

1. In the view of Physical chemistry, does S,P orbitals are contribute to make sigma bond? and If it is right, Should I draw MO diagram like this?

O2 02* 1 X1 z dz ****

(pink lines are contribution of 2s, orange lines are contribution of 2px,y,z)

My professor taught us like this in N2,C2...(lower than 5A which are has small gap between 2s and 2p) ,also he revise the Atkins by drawing these two kind of lines. BUt Im not sure and cant understand .

Please explain it clearly..!

Answer 1

The simple M.o theory propertty and numbon of unpai red electron for B2 C2 N2 02 fails to explain the magnetic modified 10 ov01come thin we considen the theory. Tn hich the mixing aan allocoad only between orbitao on atoms A amd that wore identicanin enorgy Actually mixing 1l take placa loetween al ot bitae f propen eymmetry, inhilaited ony toy tho fact that R the enongy mismatch oetween orkiteb in large, mixing will be raducad.we are there fore juatified in dis missing mixing betwen 1s and 25 os Otals The enogy diffenomce between the 25 amd 2P 0roitalo in less amd varie with the effective nuclean charge (2t). Dith a large 2* n in fluorine, the enorgy differonce io greadfen and mixing ma again be ng lectad. The diffrence in enag y loetweom +he 2s and 2p lovels dramatially inoreanes from abont 200 KJmelin the lithium atom to oloont 2500 Kj mel in tluorine. In the cane of ele mens to fie left f the series, the lower effechive nuclear charge alloas +the 2s and 2P orbitalo to come sufficionthy close to mix. B considening thin s-pmixing the magnetic property f the element (8,G ate ) ane Nell matched ith experimantal value. 62p So in the viea physio chemialry s amdParbitals are contsibnte to make sigma bond And you shoud draw thin modified Mo diagram 2 P 2P 2P 2S 25