The rare-earth elements (rare-earth metals), or the lanthanides are a set of 17 silvery-white soft heavy metals. These metals tend to tarnish slowly in air and react slowly with water to form hydroxides. They can form oxides, and at...
The rare-earth elements (rare-earth metals), or the lanthanides are a set of 17 silvery-white soft heavy metals. These metals tend to tarnish slowly in air and react slowly with water to form hydroxides. They can form oxides, and at...