安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Protactinium - Wikipedia
Protactinium is a chemical element; it has symbol Pa and atomic number 91 It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and inorganic acids
- Protactinium | Radioactive, Decay, Isotopes | Britannica
Protactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91 It occurs in all uranium ores to the extent of 0 34 part per million of uranium Its existence was predicted by Russian chemist Dmitry Mendeleyev in his 1871
- Periodic Table of Elements: Los Alamos National Laboratory
Protactinium is one of the rarest and most expensive naturally occurring elements The average concentrations of protactinium in the Earth's crust is typically on the order of a few parts per trillion, but may reach up to a few parts per million in some uraninite ore deposits
- Protactinium - Element information, properties and uses | Periodic Table
Protactinium is little used outside of research Protactinium has no known biological role It is toxic due to its radioactivity Small amounts of protactinium are found naturally in uranium ores It is also found in spent fuel rods from nuclear reactors, from which it is extracted
- Protactinium Facts - Symbol Pa or Atomic Number 91
Protactinium (Pa) is a rare, radioactive metal with atomic number 91 and a silvery-gray appearance It belongs to the actinide series and occurs naturally in trace amounts in uranium ores as part of the uranium-235 decay chain
- Protactinium | Pa (Element) - PubChem
Protactinium was first isolated by Aristid V Grosse in 1934 Protactinium is a rare, poisonous and expensive element that is present in uranium ores in very small amounts
- Protactinium: Element Properties and Uses - samaterials. com
Protactinium is a rare and highly radioactive element in the series of actinides within the periodic table It possesses several distinctive chemical and physical properties, which make it very valuable for scientific research, especially nuclear physics and studies of radioactive decay
- Protactinium Element Facts
Protactinium is a very rare shiny, silvery, highly radioactive metal that tarnishes slowly in air to the oxide Almost all naturally occurring protactinium is the 231 isotope
|
|
|