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 | Pa (Element) - PubChem
Protactinium is a chemical element with symbol Pa and atomic number 91 Classified as a n actinide, Protactinium is a solid at 25°C (room temperature) [Rn]7s 2 5f 2 6d 1 J C Slater, J Chem Phys, 1964, 41 (10), 3199-3205 DOI:10 1063 1 1725697
- 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
- Protactinium | History, Uses, Facts, Physical Chemical Characteristics
Protactinium is dense silver grey metal It is highly radioactive It belongs to actinide series and is placed between thorium and uranium in the periodic table The melting point of protactinium is lower than thorium but higher than that of uranium Protactinium crystallizes and forms a rigid tetragonal structure at room temperature
- Protactinium - Element information, properties and uses | Periodic Table
Element Protactinium (Pa), Group 20, Atomic Number 91, f-block, Mass 231 036 Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images
- 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
- Facts About Protactinium - Live Science
One of the rarest naturally occurring elements, protactinium occurs in Earth’s crust in average concentrations of a few parts per trillion This rarity makes it one of the most expensive natural
- Protactinium Facts, Symbol, Discovery, Properties, Uses - Chemistry Learner
What is Protactinium Protactinium is a highly radioactive metal belonging to the family of actinides and denoted by the chemical symbol Pa [1] It has 27 isotopes with mass numbers ranging from 212 to 238 out of which protactinium-231 is the most stable one with a half-life of 3 276 x 10 4 years
|
|
|