There are 17 Rare Earth Elements. Pick any 5 of them, and for EACH of the 5, explain in detail why they are so critical to us. Include in your answer: a. what it used for and why are those elements are so critical b. Where in the world are the resource is located and approximately how much is left? c.For EACH of the 5, please explain 3 things we need to start doing today to avoid running out of that resource. It is very important that you provide thorough and complete explanations here.

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d-Block Elements

According to the modern form of periodic table, 118 elements are present which are subdivided as four blocks, namely, s, p, d and f-block elements based on the entry of the valence electron or last electron into which orbital.