Question:

The lanthanide element that has the electronic configuration, $ [Xe]4f^{7}5d^{1}6s^{2} $ is

Updated On: Jun 8, 2024
  • lutetium
  • terbium
  • ytterbium
  • gadolinium
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The Correct Option is D

Solution and Explanation

The atomic number of gadolinium (\(Gd\)) is \(64\) and its electronic configuration is as 
\(Gd(64):[Xe]4f^{7}\,5d^{1}6s^{2}\)

It is a member of the rare earth elements group. It is silvery white, and a ductile metal with high melting and boiling point. 

So, the correct answer is (D): gadolinium

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Concepts Used:

Lanthanoids

Lanthanoids are at the top of these two-row, while actinoids are at the bottom row.

Properties of Lanthanoids

Lanthanoids are inclusive of 14 elements, with atomic numbers 58-71:

  • Cerium - Xe 4f1 5d1 6s2
  • Praseodymium - Xe 4f3 6s2
  • Neodymium - Xe 4f4 6s2
  • Promethium - Xe 4f5 6s2
  • Samarium - Xe 4f6 6s2
  • Europium - Xe 4f7 6s2
  • Gadolinium - Xe 4f7 5d1 6s2
  • Terbium - Xe 4f9 6s2
  • Dysprosium - Xe 4f10 6s2
  • Holmium - Xe 4f11 6s2
  • Erbium - Xe 4f12 6s2
  • Thulium - Xe 4f13 6s2
  • Ytterbium - Xe 4f14 6s2
  • Lutetium - Xe 4f14 5d1 6s2

These elements are also called rare earth elements. They are found naturally on the earth, and they're all radioactively stable except promethium, which is radioactive. A trend is one of the interesting properties of the lanthanoid elements, called lanthanide contraction.