Protactinium, chemical symbol

Protactinium, chemical symbol

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Credit: RICHARD WAREHAM FOTOGRAFIE/SCIENCE PHOTO LIBRARY

Caption: Protactinium. Chemical symbol and values for the radioactive element protactinium (Pa), an actinide metal. Rare in nature, it is usually extracted from spent nuclear fuel. It has a half-life of 32,760 years. The nucleus of its most stable isotope (protactinium-231) decays by emitting an alpha particle to form actinium-227. Shown here are this chemical element's atomic number (91) and its standard atomic weight (231.036).

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Keywords: actinide, artwork, atomic number, chemical, chemistry, element, illustration, isotope, metal, no-one, nobody, nuclear fuel, pa, physical chemistry, protactinium, protoactinium, radioactive, rare, school science, scientific, standard atomic weight, symbol, white background

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