# mot(molecular orbital theory) is different for above 14 electron

Dear student,

Electronic configuration of molecules containing 14 or less electrons :
Electronic configuration of molecules containing 15 or more electrons :
• This difference is dependent on the decreasing value of 's-p bonding interactions' i.e. bond interactions between 2s orbital of one atom and 2p of another atom.
• Now on moving from left to right in the periodic table i.e. from , the energy difference between 2s and 2p orbitals increases due to increase in nuclear charge and lower shielding of 2s electrons by 2p electrons.
• Due to which, increasing s-p interactions on $\sigma 2{p}_{z}$ becomes less important.
• Hence, after ${N}_{2}$ molecule the energy of $\sigma 2{p}_{z}$ molecular orbital becomes lower than that of .

Hope this information will clear your doubts about the topic.

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