<Dd> H + H → H; ΔH = − 1676 kJ / mol </Dd> <P> The low electron affinity of hydrogen and the strength of the H--H bond (∆ H = 436 kJ / mol) means that the hydride ion would also be a strong reducing agent </P> <Dl> <Dd> <Dl> <Dd> H + 2e ⇌ 2H; E = − 2.25 V </Dd> </Dl> </Dd> </Dl> <Dd> <Dl> <Dd> H + 2e ⇌ 2H; E = − 2.25 V </Dd> </Dl> </Dd>

Name two metals which can form hydrides with hydrogen