Lanthanoids are

(a) Lanthanoids and actinoids are belongs to 3rd group. b) Lanthanoids and actinoids are called as transition elements.

TO which group Lanthanoids and actinides belongs ?

Which of the following Lanthanoid is radioactive

which block elements are called Lanthanoids / actinoids ?

The sum of the first three ionization energies of the lanthanoides Ce, Eu, Gd, Yb, Lu is

The f-block consists of the two series lanthanoids and actinoids. Because Lanthanum closely resembles the Lanthanoids. The Lanthanoid resemble one another more closely than do the members ofordinary transition elements in any series. They have only one stable oxidation state. The chemistry of the actinoids is on the other hand, much more complicated. The complication arises partly owing to the occurance ofa wide range of oxidation states in these elements and partly because their radioactivity creates special problems in their study Wrong statement of the following is

Lanthanoid contraction implies

What is Lanthanoid contraction ?

The separation of lanthanoids by the ion exchange method is based on