even though
rare earth metals are much less abundant than phosphorus, they still aren't rare. elements rarer than cerium include copper, nitrogen, lead, tin, tungsten, and fortunately arsenic
> elements rarer than cerium include copper, nitrogen, lead, tin, tungsten
rarer in the sense of % on (in) earth, or % in the crust? I would have thought nitrogen requiring no mining would make it easier to obtain, even if technically rare?
even though rare earth metals are much less abundant than phosphorus, they still aren't rare. elements rarer than cerium include copper, nitrogen, lead, tin, tungsten, and fortunately arsenic