Question

What are the physical properties of lanthanoids?

Answer 1

1. Lanthanoids are soft metals with silvery white colour. Colour and brightness reduces on exposure to air.
2. They are good conductors of heat and electricity
3. Except promethium (Pm), all are nonradioactive in nature.
4. The atomic and ionic radii decrease from lanthanum (La) to lutetium (Lu).