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. ?

Is .. Across the Period, Bond Length decreases. If yes, then why N2 <

1.	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» 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