Anomalous Properties of Second Period Elements
Their anomalous behaviour is attributed to their small size , large charge / radius ratio , high electro negativity , non- availability of d- orbitals in their valence shell . the first member of each group of p-Block elements displays greater ability to form pp-pp multiple bonds to itself ( e . g . C = C , C≡C O = O , N≡N ) and to other second period elements ( e . g . C = O , C≡N , N = O ) compared to subsequent member of the group .