Thus the discovery report by the Berkeley group reads: " It is suggested that element 97 be given the name berkelium ( symbol Bk ) after the city of Berkeley in a manner similar to that used in naming its chemical homologue terbium ( atomic number 65 ) whose name was derived from the town of Ytterby, Sweden, where the rare earth minerals were first found.

This pattern of artificial production and later natural discovery has been repeated with several other radioactive naturally-occurring rare elements.

Because of the specialized and rare circumstances required for a biological structure to fossilize, only a very small percentage of all life-forms that have ever existed can be expected to be represented in discoveries, and each discovery represents only a snapshot of the process of evolution.

This discovery alerted geologists to the existence of a new class of rare earth deposit, the rare-earth bearing carbonatite, other examples of which soon surfaced, particularly in Africa and China.

The key discovery was the presence in the crater of the minerals coesite and stishovite, rare forms of silica found only where quartz-bearing rocks have been severely shocked by an instantaneous overpressure.

The discovery of fatherhood took place in a historical period for which information sources are rare, but the few scholars focusing on that period gave us a sufficiently clear picture of this discovery.

Lemierre's syndrome is currently rare, but was more common in the early 20th century before the discovery of penicillin.

This initiative for the festival was spearheaded by June Gilbreath ( fundraising and awareness ) after the discovery of a rare species of butterfly — the Diana Fritillary butterfly ( discovered by Gary Noel Ross, Ph. D. Lepidopterist ) — that was previously thought to be extinct, but is found in abundance on the mountain summit.

This discovery will be the largest and purest rare earth mineral discovery in U. S. history and investment by both Wall Street and the U. S. government with speed up its impact on global rare earth markets.

Some of the rare earths are named after the scientists who discovered or elucidated their elemental properties, and some after their geographical discovery.

The rare discovery of grave markers within these two buildings alludes to the fact that a church existed on the site of the present day church from the eleventh century, and, moreover, prior to the Norman invasion of 1066.

It is rare for only a single Portuguese man o ' war to be found ; the discovery of one usually indicates the presence of many, as they are usually congregated by currents and winds into groups of thousands.

Because of the specialized and rare circumstances required for a biological structure to fossilize, only a very small percentage of all life-forms that have ever existed can be expected to be represented in discoveries, and each discovery represents only a snapshot of the process of evolution.

In addition to current scholarly books and serials, the Mertz Library holds many rare, and historically important works ranging from medieval herbals, to 17th-century depictions of the princely gardens of Europe, to accounts of botanical exploration and discovery in the 18th century, to the writings of Carl von Linné ( Linnaeus ) and Charles Darwin.

* May 4 – A rare conjunction occurs on the New Moon including all seven of the traditional celestial bodies known from ancient times up until 1781 with the discovery of Uranus.

Many of these rare plants found their way to Fota whitin a few years of their discovery.

* E. C. Stoner publishes a paper pointing out that for a given value of the principal quantum number ( n ), the number of energy levels of a single electron in the alkali metal spectra in an external magnetic field, where all degenerate energy levels are separated, is equal to the number of electrons in the closed shell of the rare gases for the same value of n. This leads to discovery of the Pauli exclusion principle.

Jean Charles Galissard de Marignac ( 24 April 1817 – 15 April 1894 ) was a Swiss chemist whose work with atomic weights suggested the possibility of isotopes and the packing fraction of nuclei and whose study of the rare earth elements led to his discovery of ytterbium in 1878 and codiscovery of gadolinium in 1880.

However, there were some 45 sealers operating in the area and seal were already becoming rare ( a mere two years after the discovery of the islands ), and so he scouted for new hunting grounds.

For 2012, students will model proteins involved in the regulation of apoptosis as they explore the discovery and treatment of a rare ( one in a billion ) genetic trait discovered through genome sequencing.

Guitar solos and low guitar tunings are rare in black metal.

Typically they purchase coins that are composed of rare or precious metals, or coins that have a high purity of a specific metal.

This rare, very soft, malleable and easily fusible post-transition metal is chemically similar to gallium and thallium, and shows intermediate properties between these two.

Indium is a very soft, silvery-white, relatively rare poor metal with a bright luster.

Lanthanum is taken into consideration as a rare earth metal because the process to mine is difficult, time consuming and expensive.

A precious metal is a rare metallic chemical element of high economic value.

Neodymium, a rare earth metal, was present in the classical mischmetal at a concentration of about 18 %.

It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston.

It is a rare transition metal belonging to the platinum group of the periodic table.

Rhodium ( ) is a chemical element that is a rare, silvery-white, hard, and chemically inert transition metal and a member of the platinum group.

A silvery-white metallic transition metal, it has historically been sometimes classified as a rare earth element, together with yttrium and the lanthanoids.

Samarium is a rare earth metal having the hardness and density similar to those of zinc.

It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife.

Terbium is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife.

A hard, rare metal under standard conditions when uncombined, tungsten is found naturally on Earth only in chemical compounds.

Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion resistant.

Recovery of ytterbium from ores involves several processes which are common to most rare-earth elements: 1 ) processing, 2 ) separation of Yb from other rare earths, 3 ) preparation of the metal.

Unfortunately, linked to their composition, the calendar and cycle life of such alloys always remains very low, and all NiMH batteries manufactured at the present time consist of AB < sub > 5 </ sub >- type rare earth metal alloys.

The metal is costly to produce and exceptionally rare.

* In the Dungeons & Dragons game universe, adamantite is an ultra-hard, expensive, rare metal found only in meteorites and veins in magical areas, used to fashion high-quality weapons and armor.

The van der Waals constant C < sub > v </ sub > and the position of the dynamical image plane Z < sub > 0 </ sub > for various rare gases atoms adsorbed on noble metal surfaces obtained by the jellium model.

Table 1 shows the jellium model calculation for van der Waals constant C < sub > v </ sub > and dynamical image plane Z < sub > 0 </ sub > of rare gas atoms on various metal surfaces.

The increasing of C < sub > v </ sub > from He to Xe for all metal substrates is caused by the larger atomic polarizability of the heavier rare gas atoms.

Beyond the European continent, folk metal is relatively rare with only a few known acts including the aforementioned The Lord Weird Slough Feg and their fellow Americans Agalloch.