What is the highest oxidation state exhibited by actinoids?

Describe the general chemical reactions of lanthanoids with the help of a diagram and state their uses.

Which of the following elements are included in the lanthanoid series?

The element californium belongs to the family of

Which pair of ions among the following can be separated by the precipitation method?

Fill in the blanks:
$1.$ The size of $M^{3+}$ ions in the actinoid series ........... with an increase in atomic number.
$2.$ The common oxidation state of elements in the actinoid series is .......... .
$3.$ The appearance of elements in the actinoid series is like .......... .