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Because they're rare earth elements.

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12y ago

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Related Questions

What two elements are shown at the bottom of the periodic table?

Lanthanides and Actinides.


What two chunks of the periodic table are at the bottom to make it smaller?

Lanthanides & Actinides


Why are the actinides and lanthanides at the bottom of the table?

Just so it can fit on one page


Where is lanthanides and actinides in the periodic table?

The 2 bottom rows separated from the rest


What are the element at the bottom of the periodic table?

Lanthanides and actinides (or f-block elements).


What is the difference between lanthanides and actinides?

Wht is the difference between Lanthanides and Actinides?


Do actinides and lanthanides lose electrons when combining?

Actinides and lanthanides lose electrons and form cations.


Where are the lanthanides and actinides placed on the periodic table?

At the bottom of the Periodic Table


What is second period at the bottom of the periodic table called?

The first period is at the top of the table. It consists of hydrogen and helium. The bottom period is period 7.


What two are shown at the bottom of the periodic table in order to keep the table a reasonable size?

Lanthanides and actinides!


Where do the lanthanides and actinides get their names?

The lanthanides get their name from the element lanthanum, which was the first in the series to be discovered. The actinides get their name from actinium, which was the first element in this series to be discovered.


What two things are shown at the bottom of the periodic table in order to keep the table a reasonable size?

Lanthanides and actinides!