The bond length between two hydrogen atoms in a hydrogen molecule H2 can be determined by considering the atomic radius of hydrogen. Since the atomic radius of hydrogen is given as 37 pm picometers , the bond length can be calculated as follows:Bond length = 2 * atomic radiusBond length = 2 * 37 pmBond length = 74 pmSo, the bond length between two hydrogen atoms in a hydrogen molecule H2 is 74 pm. Note that the bond energy of H2 436 kJ/mol is not needed to calculate the bond length in this case.