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Explain energy level diagram for molecular orbital form by 1s orbitals. OR Explain formation of H_(2) and energy level diagram of H_(2) molecule. |
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Answer» Solution :1s atomic orbitals on two atoms (e.g. hydrogen form two molecular orbitals designated as `sigma`1s and `sigma^(**)` 1s is. `sigma` 1sis bonding molecular orbital (BMO) and `sigma`1 s is Antibonding molecular orbital (ABMO). Energy of `sigma` 1s is `LT` Energy of atomic orbital is 1s `lt sigma^(**)` 1s. (energy of `sigma` 1s + energy of `sigma^(**)` 1s) = (Edition of energy of two 1s ) The energy diagram of 1s, `sigma` 1s and `sigma^(**)` 1s is as under. Where , MO = molecular orbitals, `sigma` 1s = BMO  AO = Atomic orbitals, `sigma`1s = ABMO Note (i) Remember that in both 1s the electron spin SHOWN by `UARR and darr` (opposite). (ii) Only BMO is filled `(uarr darr)` and ABMO is empty. so, electron FIRST filled in less energy containing MO. Two MO, `sigma`1s and `sigma^(**)`1s are formed by overlapping of two 1s. Its figure is as under. 
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