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单词 brevium
释义

brevium

英汉-汉英词典
n. [核能]铀X3
词组 | 习惯用语
您要查找的是不是:
  • brevity n. 短暂,短促;简洁,简短
  • breviary n. 摘要;[天主教]每日祈祷书
  • erbium n. [化]铒
  • breve n. (罗马教皇的)谕令;二全音符,短弱音符
brevium n. 铀X3

网络短语:
registrum brevium 法院令状登记册
burnt chrome-magnesite brevium 烧结铬镁砖
中文百科

镤的同位素 Isotopes of protactinium

(重定向自Brevium)

的同位素均具有放射性,其中最稳定的为Pa,质量数在231以下的同位素主要发生α衰变生成锕,而质量数超过231的主要发生β衰变生成铀。

英语百科

Isotopes of protactinium 镤的同位素

(重定向自Brevium)

Protactinium (Pa) has no stable isotopes. There are three naturally occurring isotopes, allowing a standard mass to be given.

Relative atomic mass: 231.03588(2).

Twenty-nine radioisotopes of protactinium have been characterized, with the most stable being Pa with a half-life of 32,760 years, Pa with a half-life of 26.967 days, and Pa with a half-life of 17.4 days. All of the remaining radioactive isotopes have half-lives that are less than 1.6 days, and the majority of these have half-lives that are less than 1.8 seconds. This element also has 3 meta states, Pa (t1/2 1.15 milliseconds), Pa (t1/2 420 nanoseconds), and Pa (t1/2 1.17 minutes).

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更新时间:2025/6/18 16:41:48