from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See rare-earth element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides.
from the GNU version of the Collaborative International Dictionary of English
- n. Any rare earth element of the lanthanide series (atomic numbers 57 through 71).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any element of the lanthanide series (atomic numbers 57 through 71)
If you remember the Periodic Table of Elements from your high school chemistry class, rare earth refers to a group of 17 elements, also called lanthanide elements, with similar metallic characteristics, but differing from other metals.
Depending upon which chemist you ask, rare earth elements consist of either: the so-called lanthanide series (elements having atomic numbers from 57 [corresponding to lanthanum] to 71 [corresponding to lutetium]) or the actinide (elements 89 to 103) and lanthanide series.
After a long, relentless campaign of price wars and export quota reductions, more than 95 per cent of the global supply of rare earth metals - a group of 17 "lanthanide" elements employed in hundreds of technologies ranging from mobile phones and BlackBerrys to lasers and aviation
Depending upon which chemist you ask, rare earth elements consist of either: the so-called lanthanide series (elements having atomic numbers from 57 [corresponding to lanthanum] to 71 [corresponding to lutetium]
In this connection, Dr. Seaborg demonstrated that the heavy elements form a "transition" series of actinide elements in a manner analogous to the rare-earth series of lanthanide elements.
REE assay values are reported by convention as the combined oxide equivalents REO of the fifteen elements in the lanthanide series + yttrium.
Roy next plans on analyzing alloys with added lanthanide, iron, and silicon.
He hopes to soon expand his research and analyze alloys doped with lanthanide, iron, and silicon.
It is included in the lanthanide group along with Description
Assistant Professor of Engineering Rashid Zia '01 was honored Jan. 13 for his research on lanthanide ions.
Wordnik is becoming a not-for-profit! Read our announcement here.