The lanthanides were firstly discovered in_________

• USA

• Scandinavia

• Russia

• Arab World

Lanthanide series, a series of metallic elements, included in the rare-earth metals , in _________ of the periodic table

• Group 1

• Group 2

• Group 3

• Group 5

The light rare earth elements are

• Ce-Yb

• La-Gd

• Tb-Lu

• Pr-Lu

1. The electronic configuration of Tb (Z = 65) is

• [Xe] 4f⁹ 6s²

• [Xe] 4f⁸ 5d¹ 5s²

• [Xe] 4f¹¹

• [Xe] 4f¹⁴

Which of the following lanthanide ions are stable in water?

• Sm²⁺

• Ce⁴⁺

• Pr³

• Tb⁴

Which of the following lanthanides is used in Laser technology?

• Y

• Nd

• Lu

• La

Ion size of lanthanide is _____

• Increase from La-Lu

• Decrease from Lu-La

• Decrease from La-Lu

• Increase from Ac-Th

Smallest atomic radius of lanthanide is

• Sm²⁺

• Sm³⁺

• Tm³⁺

• Tm²⁺

The geometry of nine-coordinate system is

• Tricapped trigonal prismatic

• Octahedral

• Square antiprismatic

• Dodecahedral

What is the most stable ligand chelating a lanthanide?

• EDTA

• H₂O

• Oxalate

• pyridine