Answer:
Lanthanides and actinides
Step-by-step explanation:
The inner transition metals consist of two series called lanthanides and actinides.
These are f block elements.
The lanthanide series having elements with atomic number 58-71. These are 14 elements.
The lathanides are mostly used in laser technology.
They deflect the I.R and U.V radiations and used in sun glasses.
The actinides series also consist of 14 elements with atomic number 90- 103.
All the elements have very similar properties.
All acitinides are radioactive.
All inner transition metals are placed at the bottom of periodic table.