Arrange the following elements in the in...

Arrange the following elements in the increasing order of their first ionisation potentials, give proper explanation for your answer.
a) Li, Be, B b) N, O, F c ) C, N, O, F

Answer

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The increasing order of the first ionisation enthalpy of the elements B,P,S and F ( lowest first ) is :

`B lt P lt S lt F`

`B lt S lt P lt F`

`F lt S lt P lt B`

`P lt S lt B lt F`

Correct order of 1st ionization potential among elements Be,B,C,N,O is

`BltBeltCltOltN`

`BltBeltCltNltO`

`BeltBltCltNltO`

`BeltBltCltOltN`

Considering the elements B, C, N, F and Si, the correct order of their non-metallic character is

B >C>Si>F>Si

Si >C >B >N>F

F>N>C>B>Si

F>N>C>Si>B