Comment on No rare earth metals in the Model SparentComments−jonnathanson12yTechnically it's not in the set of rare earth metals, though it is rare (at least in naturally occurring and isolated form).−gilgoomesh12yAnd rare earth metals are not rare. So it's completely different.
Comments
Technically it's not in the set of rare earth metals, though it is rare (at least in naturally occurring and isolated form).
And rare earth metals are not rare. So it's completely different.