A lanthanide element is any element that resides in the Lanthanide series on the Periodic Table. The Lanthanide series is just under the Actinide series on the Periodic Table and is usually seperated from the main part of the Periodic Table. All of the Lanthanide elements are radioactive.
they come from the balanced equations
Only Fluorine belongs in the halogen family.
The correct answer is: The electrons farthest away from the nucleus...
chris ellis
They are silvery metals that conduct electricity
they are harder than alkali metals
The biggest safety concerns relating to walking surfaces are probably the various conditions and defects that can result in slips, trips, and falls.
Argon (Ar) is one of them