Q. Consider the following statements regarding the Rare Earth Elements (REE):
1. The rare earth elements are all metals.
2. Rare earth element Cerium Oxide is used for polishing Granite and Marble stones.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: C
Notes:

Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table.  

  • The group consists of yttrium and the 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium).  
  • Scandium is found in most rare earth element deposits and is sometimes classified as a rare earth element.  
  • The rare earth elements are all metals and the group is often referred to as the “rare earth metals.”  
  • These metals have many similar properties, and that often causes them to be found together in geologic deposits.  
  • They are also referred to as “rare earth oxides” because many of them are typically sold as oxide compounds. 
  • A large number of alloys are made more durable by the addition of rare earth metals.  
  • Glass, granite, marble, and gemstones are often polished with cerium oxide powder. Many motors and generators contain magnets made with rare earth elements.  
  • Phosphors used in digital displays, monitors, and televisions are created with rare earth oxides. Most computer, cell phone, and electric vehicle batteries are made with rare earth metals. 

Source: The Hindu 

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