Rare Earth Elements questions.?

Question

How many Rare Earth elements are there?
What group and periodds are the Rare Earth elements found in?

Answer 1

Rare earth elements and rare earth metals are a collection of sixteen chemical elements in the periodic table, namely scandium, yttrium, and fourteen of the fifteen lanthanides (excluding promethium), which naturally occur on the Earth. The former two are included as they tend to occur with the latter in the same ore deposits. Some definitions additionally include the actinides. The terms "rare earth" and "rare earth metal" are trivial names that fall outside the official IUPAC nomenclature system.

Answer 2

The thirty rare earth elements are composed of the lanthanide and actinide series.

One element of the lanthanide series and most of the elements in the actinide series are called trans-uranium, which means synthetic or man-made. All of the rare earth metals are found in group 3 of the periodic table, and the 6th and 7th periods. The Rare Earth Elements are made up of two series of elements, the Lanthanide and Actinide Series.

The Rare Earth Elements are:


Lanthanide Series-:

Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium

Actinide Series-:

Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium

http://www.chemicalelements.com/groups/rareearth.html

Answer 3

between lanthnum and hafnium is a chain of 14 aspects cerium to lutetium, that are the 1st inner transition sequence. they're often called lannthanide sequence or uncommon earth. so the 1st uncommon earth is Ce or cerium.

Answer 4

im rare