April 2020
Intermediate to advanced
296 pages
5h 20m
English

Soft, ductile praseodymium’s green oxide flakes away,
With Nd in didymium, shields welders’ eyes each day.
Helps magnets build strong north-south poles,
THIRD IN THE LANTHANOID SERIES
Praseodymium is a silvery, soft, ductile rare-earth metal. It oxidizes slowly in air, producing a green oxide surface layer that duly flakes off, exposing more of the underlying metal to oxidation. Its name, from the Greek for green twin, reflects the fact that many of its compounds are green in ...