Protactinium - Wikipedia
网页Appearance. 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 - Element information, properties and uses
网页Element Protactinium (Pa), Group 20, Atomic Number 91, f-block, Mass 231.036. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Protactinium (Pa) - Definition, Preparation, Properties, Uses ...
网页2024年9月17日 · Reaction with Acids: Protactinium dissolves in hydrochloric acid (HCl) and nitric acid (HNO3), forming protactinium(IV) or protactinium(V) solutions depending on the conditions, and releasing hydrogen gas: Pa+4 HCl→PaCl₄+2 H₂ Pa+5 …
Protactinium (Pa)
网页Protactinium is the 91st element in the periodic table and has a symbol of Pa and atomic number of 91. It has an atomic weight of (231.03588) and a mass number of 231. Protactinium has ninety-one protons and one hundred forty neutrons in its nucleus, and ninety-one electrons in seven shells.
Protactinium Element Facts - chemicool.com
网页Appearance and Characteristics. Harmful effects: Protactinium is harmful due to its radioactivity and is also toxic. Characteristics: 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.
Protactinium (Pa) - Periodic Table
网页Protactinium is a chemical element of the periodic table with chemical symbol Pa and atomic number 91 with an atomic weight of 231.036 u and is classed as actinide. Protactinium is solid at room temperature.
Protactinium | Pa (Element) - PubChem
网页Protactinium is a rare, poisonous and expensive element that is present in uranium ores in very small amounts. In 1961, the Great Britain Atomic Energy Authority was able to produce 125 grams of 99.9% pure protactinium, although they had to process about 55,000 kilograms of ore and spend about $500,000 to get it.
Pictures, stories, and facts about the element Protactinium in the ...
网页Protactinium occurs in vanishingly small quantities in the natural decay chains of uranium and thorium minerals. At most a few atoms at a time exist in a rock like this, and you can't see any of them. Scroll down to see examples of Protactinium. Larger | Spin | …
Element: Protactinium — Periodic table
网页Protactinium (formerly protoactinium) is a radioactive chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray actinide metal which readily reacts with oxygen, water vapor and inorganic acids.
Protactinium, Physical and Chemical Properties | SpringerLink
网页Protactinium is a radioactive metal formed in the decay chain of uranium but not thorium (Fig. 1). It exists in two crystalline forms: α-Protactinium is tetragonal body-centered ( a = 393.1 pm, c = 323.6 pm) and β protactinium is cubic face-centered ( a = 501.9 pm).
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