Lithium, whose silvery-white colour tarnishes on oxidation when exposed to air, is the most electropositive metal (−3.04 V versus a standard hydrogen electode), the lightest (M = 6.94 g mol −1 ...

(Photo by Martín SILVA / AFP) (Photo by MARTIN SILVA/AFP via Getty Images) As green technology progresses and proliferates, our dependence on lithium will only deepen. Smartphones, solar panels ...