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Protactinium, chemical symbol

Protactinium, chemical symbol

C038/9831

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Credit

RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY 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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