Protactinium is a chemical element with symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic ...
What's in a name? From the Greek word for first, protos, and the element actinium, which together mean "the parent of actinium." Say what? Protactinium is pronounced ...
Protactinium's properties, discovery, videos, images, states, energies, appearance and characteristics.
Protactinium has a bright metallic lustre which it retains for some time in air. The element is superconductive below 1.4 K. The element is a dangerous toxic material ...
Element Protactinium (Pa), Group 20, Atomic Number 91, f-block, Mass 231.036. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Properties of protactinium. As a metal, protactinium is dense and silvery-gray with a bright metallic luster, which it retains for some time in air.
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protactinium (prō'tăktĭn`ēəm), radioactive chemical element; symbol Pa; at. no. 91; mass number of most stable isotope isotope, in chemistry and physics, one of ...
Protactinium is a radioactive element predicted to exist in 1871 by Mendeleev, although it was not discovered until 1917 or isolated until 1934.
Notable characteristics. Protactinium is a silver metallic element that is in the actinide group, with a bright metallic shine that it keeps for some time in the air.