Question

what is actinide series

Answer 1

the actinide series encompasses the 15 metallic chemical elements with atomic no. from 89 to 103.

Answer 2

Dear user !!

It is a  series of heavy radioactive metallic elements of increasing atomic number considered to be analogous to the lanthanide series and to begin with actinium (89) or thorium (90) and end with element of atomic number 103.

Hope it helps you !!