Question

Which is the last element of lanthanides?

• A. Ytterbium
• B. Lutetium
• C. Thulium
• D. Erbium

Answer 1

The correct option is B Lutetium

The Lanthanides are rare earth elements of the modern periodic table. It means that the elements with atomic numbers ranging from 58 to 71 following the element Lanthanum.
The atomic numbers of Erbium, Thulium, Ytterbium and Lutetium is 68, 69, 70 and 71 respectively. So the last element of lanthanide series is Lutetium with electronic configuration $\left[Xe\right]4f^{14}5d^{1}6s^2$.