Rare earth elements or rare earth metals are a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium.
Scandium and yttrium are considered rare earth elements since they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties.
| Name | Symbol | Atomic Number | Atomic Weight |
|---|---|---|---|
| Cerium | Ce | 58 | 140.115 |
| Praseodymium | Pr | 59 | 140.90765 |
| Neodymium | Nd | 60 | 144.24 |
| Promethium | Pm | 61 | -144.9127 |
| Samarium | Sm | 62 | 150.36 |
| Europium | Eu | 63 | 151.965 |
| Gadolinium | Gd | 64 | 157.25 |
| Terbium | Tb | 65 | 158.92534 |
| Dysprosium | Dy | 66 | 162.5 |
| Holmium | Ho | 67 | 164.93032 |
| Erbium | Er | 68 | 167.26 |
| Thulium | Tm | 69 | 168.93421 |
| Ytterbium | Yb | 70 | 173.04 |
| Lutetium | Lu | 71 | 174.967 |
| Thorium | Th | 90 | 232.0381 |
| Protactinium | Pa | 91 | 231.03588 |
| Uranium | U | 92 | 238.0289 |
| Neptunium | Np | 93 | -237.0482 |
| Plutonium | Pu | 94 | -244.0642 |
| Americium | Am | 95 | -243.0614 |
| Curium | Cm | 96 | -247.0703 |
| Berkelium | Bk | 97 | -247.0703 |
| Californium | Cf | 98 | -251.0796 |
| Einsteinium | Es | 99 | -252.083 |
| Fermium | Fm | 100 | -257.0951 |
| Mendelevium | Md | 101 | -258.0984 |
| Nobelium | No | 102 | -259.1011 |
| Lawrencium | Lr | 103 | -262.1098 |
Introduction Darmstadtium is a radioactive chemical element with an atomic number of 110 in the periodic table. Classified as transfermium, darmstadtium does not occur naturally in Earth’s crust. This noble metal has two valence electrons and belongs to the transuranium family of periodic table elements. Fact Box Chemical and Physical Properties of Darmstadtium The symbol … Read more
Introduction Actinium is a rare-earth element that belongs to the family of actinides in the periodic table. The actinide series of elements is highly significant due to their radioactive properties. They comprise a group of 15 chemical elements that share the same chemical and physical properties. Fact Box Physical and Chemical Properties of Actinium … Read more
Lanthanum (La) Introduction Lanthanum is a chemical element with atomic number 57 in the periodic table. In Earth’s crust, element 57 is mainly contained as the ferromagnetic metal cobalt (Co). This rare-earth metal is classified as a member of the lanthanides family of chemical elements. As a transition metal, lanthanum is a chemical that has … Read more
Cerium is a chemical element with an atomic number of 58 in the periodic table of elements. It’s the most abundant rare-earth metal that is found in Earth’s crust. Being a member of the lanthanides family of periodic table elements, this transitional element from period 6 in the periodic table of elements has four valence … Read more
Praseodymium (Pr) Introduction Praseodymium is a chemical element with the atomic number 59 in the periodic table. It occurs naturally in Earth’s crust with an abundance of 9.5 parts per million. However, praseodymium can be rarely found in its pure, elemental form. Being a member of the lanthanides family of elements, this highly reactive chemical … Read more
Neodymium (Nd) Introduction Neodymium is a chemical element with the atomic number 60 in the periodic table. Despite being classified as a rare-earth element, neodymium is widely distributed in Earth’s crust. It mainly occurs in the mineral ores. As a member of the lanthanide series of periodic table elements, this rare-earth metal has three valence … Read more
Promethium (Pm) Introduction Promethium is a chemical element with the atomic number 61 in the periodic table. Although it’s an artificially produced substance that cannot be found in Earth’s crust, promethium can also occur in trace amounts in the uranium ores. Element 61 is classified as a member of the lanthanides family of the periodic … Read more
Samarium (Sm) Introduction Samarium is a chemical element with the atomic number 62 in the periodic table. With an abundance of 6 parts per million, it’s the 40th most abundant chemical element in Earth’s crust. Being a member of the lanthanides family of periodic table elements, this rare-earth element is a divalent substance that’s widely … Read more
Introduction Europium is a chemical element with an atomic number of 63 in the periodic table of elements. It’s one of the least abundant rare-earth elements that can be traced in Earth’s crust. Being a member of the lanthanides family of periodic table elements, europium is a divalent chemical element that makes it one of … Read more
Introduction Gadolinium (Gd) is a chemical element with an atomic number of 64 in the periodic table of elements. There’s about 6.2 mg/kg of this soft metal occurring in Earth’s crust. This makes gadolinium one of the most abundant rare-earth elements found in nature. Being a member of the lanthanides family of periodic table elements, … Read more