synthetic elements, in chemistry, radioactive elements that were not discovered occurring in nature but as artificially produced isotopes. They are technetium (at. … 43), which was the first element to be synthesized, promethium (at. no.
|Element name||Chemical Symbol||Atomic Number|
promethium (Pm), chemical element, the only rare-earth metal of the lanthanide series of the periodic table not found in nature on Earth.
Named for the Greek Titan who stole fire from Zeus and gave it to humanity, glow-in-the-dark promethium is a highly radioactive, rare earth element. It is not found anywhere on Earth and is found in the byproducts of uranium fission reactions.
|Classification:||Promethium is a lanthanide and rare earth metal|
|Atomic weight:||(145), no stable isotopes|
|Melting point:||1142oC, 1415 K|
lawrencium (Lr), synthetic chemical element, the 14th member of the actinoid series of the periodic table, atomic number 103. Not occurring in nature, lawrencium (probably as the isotope lawrencium-257) was first produced (1961) by chemists Albert Ghiorso, T.
This revelation would eventually lead to the development of nuclear weapons — and meant that Segrè and Perrier’s eka-manganese was the first true synthetic element. In 1947, ten years after its discovery, they named it technetium, after ‘technetos’, the Greek word for ‘artificial’7.
Of the 94 naturally occurring elements, those with atomic numbers 1 through 82 each have at least one stable isotope (except for technetium, element 43 and promethium, element 61, which have no stable isotopes).
The period 6 inner transition metals (lanthanides) are cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).
Most promethium is used for research purpose. It can be used as beta radiation source in luminous paint, in nuclear batteries for guided missiles, watches, pacemakers and rados, and as a light source for signals. It is possible that in future it will be used as portable X-ray source.
Definition of promethium : a radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium — see Chemical Elements Table.
Lutetium ( IPA: /l(j)uːˈtiːʃiəm/) is a chemical element with the symbol Lu and atomic number 71. A metallic element of the transition metal group, lutetium usually occurs in association with yttrium and is sometimes used in metal alloys and as a catalyst in various processes.
Promethium-147 is available at a cost of about 50c/Ci.
Superman flies off to his Fortress of Solitude, where the analysis reveals that Metallo contains promethium, the “strongest metal known to man,” according to the analysis.
Answer and Explanation: Here the electrons are fully paired and these show diamagnetic nature.
PromethiumPhase at STPsolidMelting point1315 K (1042 °C, 1908 °F)Boiling point3273 K (3000 °C, 5432 °F)Density (near r.t. )7.26 g/cm3
Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative element, it is extremely reactive, as it reacts with all other elements, except for argon, neon, and helium.
Most elements are either metals or nonmetals. Germanium falls in the same group as carbon and silicon, but also as tin and lead. Germanium itself is classified as a metalloid.
Properties and reactions Bismuth is a rather brittle metal with a somewhat pinkish, silvery metallic lustre. Bismuth is the most diamagnetic of all metals (i.e., it exhibits the greatest opposition to being magnetized). It is hard and coarsely crystalline.
Its atomic number is 9 and its atomic weight is 19, and it’s a gas at room temperature. It is the most electronegative element, given that it is the top element in the Halogen Group, and therefore is very reactive. It is a nonmetal, and is one of the few elements that can form diatomic molecules (F2).
However, on a significant number of more recent periodic tables you will find lutetium and lawrencium classified as transition metals and placed directly underneath scandium and yttrium in group 3 of the periodic table.
BRIAN M. The electron configuration 1s22s22p63s23p2 is the element Silicon.
Sources of lawrencium Lawrencium is artificially produced, and has only been made in small quantities. It can be produced by bombarding californium placed in a linear accelerator with boron ions. This method has been used in multiple experiments and several different isotopes of lawrencium have been produced this way.
With the accidental discovery in 1856 of the first commercialized synthetic dye, mauve, Perkin introduced a new era in the chemical industry. While attempting to produce quinine, William Henry Perkin serendipitously synthesized mauve, the first commercialized synthetic dye.
Baekeland continued to explore possible combinations of phenol and formaldehyde, intrigued by the possibility that such materials could be used in molding. By controlling the pressure and temperature applied to phenol and formaldehyde, he produced his dreamed-of hard moldable plastic: Bakelite.
Elements 1 through 92 (except for elements 43 and 61) occur naturally on Earth, although some are only present in extremely small quantities. The elements following uranium on the periodic table are only produced artificially, and are known as the transuranium or transuranic elements.
There are just six metalloids. In addition to silicon, they include boron, germanium, arsenic, antimony, and tellurium. Metalloids fall between metals and nonmetals in the periodic table.
Metalloids are sometimes called semimetals, a practice that has been discouraged, as the term semimetal has a different meaning in physics than in chemistry.
What is a naturally occurring chemical? … an unprocessed chemical that is found in nature, such as chemicals from plants, micro-organisms, animals, the earth and the sea. a chemical that is found in nature and extracted using a process that does not change its chemical composition.
Yes, promethium will conduct electricity, but it is not as optimal a conductor as copper, silver, and gold.
- Promethium(III) chloride.
- Promethium(III) fluoride.
- Promethium(III) hydroxide.
- Promethium(III) nitrate.
- Promethium(III) oxide.
Hazards and Risks Promethium is studied in a few nuclear research laboratories where its high radioactivity require special handling techniques and precautions. All promethium compounds should be regarded as highly toxic largely because of its radiological toxicity. The metal dust presents a fire and explosion hazard.
When alloyed with titanium and vanadium, it forms a near-invulnerable metal. The bionic and cybernetic components of Cyborg (Victor Stone) are made out of depleted promethium, and Arsenal of the Justice League of America wears a bodysuit that combines both depleted promethium and Kevlar.
Promethium is named after Prometheus of Greek mythology who stole fire from the Gods and gave it to humans.
Promethium atom is a lanthanoid atom and a f-block element atom. A radioactive element of the rare earth family of metals. It has the atomic symbol Pm, and atomic number 61.
The metal is in solid state at room temperature, and its boiling point is 2460 C. The chemical properties of promethium are little studied because it is radioactive.
Lutetium oxide is used to make catalysts for cracking hydrocarbons in the petrochemical industry. Lu is used in cancer therapy and because of its long half-life, 176Lu is used to date the age of meteorites. Lutetium oxyorthosilicate (LSO) is currently used in detectors in positron emission tomography (PET).
Indium is a soft, malleable metal with a brilliant lustre. The name indium originates from the indigo blue it shows in a spectroscope. Indium has a low melting point for metals and above its melting point it ignites burning with a violet flame.
Some general chemistry textbooks (for example 3, 4) have adopted the placement of lanthanum (La) and actinium (Ac) in the f- block and lutetium (Lu) and lawrencium (Lr) in the d-block.