1.

Which of the following molecules/ions does not contain unpaired electrons ?

Answer»

1. `B_(2)`
2. `N_(2)^(+)`
3. `O_(2)`
4. `O_(2)^(2-)`

Solution :Molecular ORBITAL electronic configuration are :
`O_(2) : KK(sigma_(2S))^(2)(sigma_(2s)^(**))^(2)(sigma_(2s)^(2))^(2)(pi_(2px)^(2))^(2)(pi_(2py)^(2))^(2)`
`(pi_(2px)^(**))^(1)(pi_(2py)^(**))^(1)`(2 unpaired electrons)
`O_(2)^(2-) : KK (sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(sigma_(2pz))^(2)(pi_(2px))^(2)(pi_(2py))^(2) (""^(**)pi_(2px))^(2)(pi_(2py)^(**))^(2)`(no unpaired ELECTRON)
`N_(2)^(+) :KK(sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2px))^(1)(pi_(2py))^(1)` (1 un-paired electrons)
`B_(2) : KK (sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2px))^(1)(pi_(2py))^(1)`(2 unpaired electrons).


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