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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 prot·ac·tin·i·um /ˌproˌtækˈtɪniəm/
 鏷

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 prot·ac·tin·i·um /ˌproto-/ 名詞
 鏷

From: WordNet (r) 2.0

 protactinium
      n : a short-lived radioactive metallic element formed from
          uranium and disintegrating into actinium and then into
          lead [syn: protoactinium, Pa, atomic number 91]

From: Elements database 20001107

 protactinium
 Symbol: Pa
 Atomic number: 91
 Atomic weight: (231)
 Radioactive metallic element, belongs to the actinoids. The most stable
 isotope, Pa-231 has a half-life of 2.43*10^4 years. At least 10 other
 radioactive isotopes are known. No practical applications are known.
 Discovered in 1917 by Lise Meitner and Otto Hahn.