Europium

Europium is a chemical element with the symbol Eu and atomic number 63. It belongs to the lanthanide series, a group of elements located in the f-block of the periodic table. Europium is a soft, silvery-white metal that is highly reactive and can ignite in air at room temperature. It is the most reactive of the rare earth elements and can react with water to produce hydrogen gas.

The f-block is so named because the outermost electron of these elements is in a specific type of orbital called the f-orbital. The f-orbitals are part of the electron configuration of atoms and are characterized by their shape and energy levels. They have complex shapes that include lobes and nodes^[1], and they can hold up to 14 electrons. The f-orbitals are found in the fourth and fifth energy levels (shells) of the atom. The lanthanide series, also known as the rare earth elements, consists of 15 elements from atomic number 57 (lanthanum) to 71 (lutetium). These elements fill the 4f orbital. The actinide series, which follows the lanthanides, includes the 15 elements from atomic number 89 (actinium) to 103 (lawrencium) and fills the 5f orbital.

Europium was discovered in 1890 by the French chemist Eugène-Anatole Demarçay. He isolated europium from samarium, another element in the lanthanide series. Demarçay was a French chemist known for his significant contributions to the field of chemistry. He was born on July 16, 1852, in Nogent-le-Rotrou, France. Demarçay pursued his education at the École Normale Supérieure in Paris, where he studied under the guidance of renowned chemists such as Henri Sainte-Claire Deville and Charles Friedel.

He earned his doctorate in chemistry in 1878 and went on to work at the Museum of Natural History in Paris. Demarçay focused his research on the analysis of rare earth elements, and in 1896, he successfully isolated and identified europium, a remarkable achievement that expanded the understanding of the periodic table.

Throughout his career, Demarçay made numerous important contributions to the field of chemistry and was recognized for his exceptional work. He was elected as a member of the French Academy of Sciences in 1906 and received several prestigious awards for his scientific accomplishments.

Europium has two stable isotopes: europium-151 and europium-153. Europium-153 is used in nuclear medicine for various imaging and therapeutic applications. Europium is primarily used in the production of phosphors. It is a key component in red and blue phosphors used in television screens, computer monitors, and fluorescent lamps.

Europium-based phosphors are also utilized in cathode-ray tubes, plasma displays, and LEDs. Additionally, europium compounds are employed in the field of nuclear energy and in the manufacturing of lasers. Europium is known for its unique luminescent properties. When certain europium compounds are exposed to ultraviolet light, they emit a bright red or blue fluorescence. This property makes europium useful in various optical and imaging applications.

Europium is a ferromagnetic material at low temperatures. It displays a unique phenomenon called “magnetic ordering,” where its magnetic moments align parallel to each other.

This property makes europium valuable in magnetic resonance imaging (MRI) and as a contrast agent. Europium is relatively rare in the Earth’s crust, occurring at an average concentration of about 2 ppm (parts per million). It is primarily found in minerals such as monazite, bastnäsite, and xenotime. It is obtained as a byproduct during the extraction of other rare earth elements.

Europium has no known biological role and is considered to be non-toxic. However, due to its reactive nature, it should be handled with caution. Pure Europium goes for around $1350.00 a gram.