How many maximum bonds can element X in group 15 do with other element Y in group 15. triple bond

single bond

double bond

can't bond

They make up examples of physical properties 

Ithink b not to sure hope that : )

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.