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LANTHANIDE SERIES OF METALS
When you look at the periodic table you will see two rows that kind of sit off to the bottom. One of those rows is called the Lanthanide series. There are a bunch of names that you may hear that describe these 15 elements. Some say Lanthanide, some say rare-earth and some say inner-transition elements. No matter what you choose everyone will know what you mean if you say Lanthanide.
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Fifteen elements that start with lanthanum (La) at atomic number 57 and finishing up with lutetium (Lu) at number 71. It's doubtful your teachers will ever ask you to remember all of the elements in the series, just remember lanthanum.
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