1) Atomic number 91 2) Chemical element 3) Element discovered in 1913 4) Element number 91 5) Element with the symbol Pa 6) Metal 7) Metallic element 8) Protoactinium
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1) Protoactinium
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https://www.crosswordclues.com/clue/protactinium
Protactinium is a chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds where protactinium is usually present in the oxidation state +5, but can also assume +4 and even +2 or +3 states. The average concentrat...
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http://en.wikipedia.org/wiki/Protactinium
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 ... [3 related articles]
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http://www.britannica.com/eb/a-z/p/122
(Pa) A rare, radioactive, metallic element of the actinide series, first identified in 1913. Its chief source is uraninite. More than 12 isotopes are known; all radioactive. Its most stable isotope is
231Pa (half-life 3.25 × 10
4...
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<chemical> Protactinium. A radioactive element of the actinide group of metals. It has the atomic symbol pa, atomic number 91, and atomic weight 231. It decays by alpha-emission. ... Chemical name: Protactinium ... (12 Dec 1998) ...
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(Pa) (pro″tak-tin´e-әm) a chemical element, atomic number 91, atomic weight 231.
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(Pa) Type: Term Pronunciation: prō′tak-tin′ē-ŭm Definitions: 1. A radioactive element, atomic no. 91, atomic wt. 231.03588, formed in the decay of uranium and thorium; its most long-lived isotope, 231Pa, has a half-life of 32,500 years. Synonyms: proactinium, protoactinium
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Protactinium is a rare actinide element with the symbol Pa.
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[
n] - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
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A radioactive element. Symbol Pa
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protoactinium noun a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
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Silver-grey, radioactive, metallic element of the actinide series, atomic number 91, relative atomic mass 231.036. It occurs in nature in very small quantities in pitchblende and other uranium ores. It has 14 known isotopes; the longest-lived, Pa-231, has a half-life of 32,480 years
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a radioactive, metallic element. Symbol: Pa; at. no.: 91.
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https://www.infoplease.com/dictionary/protactinium
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