1thanx..,
σ-bond is stronger than a Π-bond.....
hence when electrons are filled in the molecular orbitals σ2px should be filled before Π2py (or 2pz), (as in case of molecules with no. of electrons ≥ 15)....
but for molecules with electrons ≤ 14, the Π2p orbital is filled before σ2p!!!!
WHY???
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7 Answers
49well this change in theory was made in order to satisfy the magnetic properties of diatomic boron...
check out with the 2 formats
in the revised format the magnetic property of diatomic boron comes to be paramagnetic unlike the old format and that is true! (i.e. diatomic boron is paramagnetic)
71Well, We just know that the former has lower energy as latter has higher Energy.
But All in this sense are theoretical. Who knows that a new compound may again cause a twist in these patterns.
1there is nothing lik experiment involved in dis case and itz clear frm the defintion dat hybridisation occurs b/w AOs of identical or nearly same energy .............so after 14 electron series is over the energy gap b/w 3s and 3d AO is large when compared to 2s and 2p AOs so it happens dear..........and it is clearly mentioned ncert 11 so u can refer it i f u wan...............................