Question

Is .. Across the Period, Bond Length decreases. If yes, then why N2 < O2 < F2 .. we get this order if we compare their bond lenght.
Is this type of Concepts is used for all atoms in 15th, 16th and 17th, groups. ?

Answer 1

Answer:

there is no generalisation that across a period bond length decreases as bond orders may be different for different molecules ( 3 for N2 2 for O2 and 1 for F2) also generalisation of bond order in a group depends upon the type of the compound formed , eg in group 17 if bond length is compared for F2 Cl2 and Br2 it'll be in order ( Cl2<F2<Br<I2 ) however for HF HBr HCl HI ( HF<HCl<HBr<HI) so you have to check for each type of compounds the bond order may be different for a series