Question

why lanthanides are called as rare earth metal?

Answer 1

The elements scandium and yttrium are also known as the “rare earths” because they were originally discovered together with thelanthanides in rare minerals and isolated as oxides, or “earths.” Collectively, these metals are alsocalled rare earth elements 

Answer 2

Answer:

Why lanthanides are called as rare earth metal?

Explanation:

• What are Lanthanides? and what are rare Earth metal?
• In the modern periodic table- Lanthanides are the rare earth elements. They are the elements with 58 to 71 atomic numbers following the element Lanthanum.
• They are called rare Earth metal because there occurrence of elements is very small. That is $3 \times10^{-4}$ of Earth's crust.
• Lanthanides are used as a catalyst in the manufacture of petroleum and synthetic products.
• Thoria and Ceria are used in lamps. They are also used in magnets, lasers and motion picture projectors and X -ray intensity screens.
• The Alloys of Lanthanides are used in the instrumental steels, stainless steel, and also it is used in heat resistance.

Hence, Lanthanides are called as rare earth metal.

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