英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:

einsteinium    
n. 锿



einsteinium
n 1: a radioactive transuranic element produced by bombarding
plutonium with neutrons [synonym: {einsteinium}, {Es}, {E},
{atomic number 99}]

Es \Es\ n.
the chemical symbol for {einsteinium}, a transuranic element
with atomic number 99. The atomic weight of the longest-lived
isotope, with a half-life of 276 days, is 254. The first
isotope discovered, having atomic weight 253 and a half-life
of 20 days, was recognized in 1952 in the debris from a
hydrogen bomb test. As much as 3 micrograms of einsteinium
were produced by a complex process involving long irradiation
of plutonium isotopes in nuclear reactors. Its chemical
properties are those of a trivalent actinide element. --HCP61

Syn: einsteinium, atomic number 99.
[WordNet 1.5 PJC]

einsteinium
Symbol: Es
Atomic number: 99
Atomic weight: (254)
Appearance is unknown, however it is most probably metallic and silver
or gray in color. Radioactive metallic transuranic element belonging to
the
actinoids. Es-254 has the longest half-life of the eleven known isotopes
at
270 days. First identified by Albert Ghiorso and associates in the
debris of
the 1952 hydrogen bomb explosion. In 1961 the first microgram quantities
of
Es-232 were separated. While einsteinium never exists naturally, if a
sufficient amount was assembled, it would pose a radiation hazard.



安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • The Epoch Times | Breaking News, Latest News, World News and Videos
    Get the latest breaking news, in-depth reporting, and insightful analysis on a wide range of topics, including politics, culture, and world events | The Epoch Times is a trusted source for
  • News Latest Stories | The Epoch Times
    Get the latest breaking news, in-depth reporting, and insightful analysis on a wide range of topics, including politics, culture, and world events | The Epoch Times is a trusted source for
  • The Epoch Times - Wikipedia
    Since 2009, The Epoch Times has published at least 17,000 articles related to Shen Yun, promoting it and attacking its critics by insinuating that they are agents of the Chinese Communist Party
  • The Epoch Times - YouTube
    As part of The Epoch Times Association, Inc , a nonprofit organization we stand outside of political interests and the pursuit of profit, to educate readers about today’s most critical issues
  • The Epoch Times - Bias and Credibility - Media Bias Fact Check
    The Epoch Times is an international, multilingual newspaper and digital media organization founded in 2000 by John Tang and other Chinese-American Falun Gong practitioners
  • The Epoch Times | New York NY - Facebook
    The Epoch Times obtained thousands of photos depicting the 1989 pro-democracy student protest movement in China’s Tiananmen Square
  • Epoch Times
    This full replica of our printed product provides you the newspaper as you know and love it from the convenience of the web
  • Newspaper - TheEpochTimes
    The Epoch Times is one of the last media that does real investigative reporting For the past three years, we have been investigating and uncovering the problems within the “Crossfire Hurricane” probe as well as other major issues facing our nation
  • 大纪元 | 大纪元新闻网
    本网站图文内容归大纪元所有,任何单位及个人未经许可,不得擅自转载使用。 Copyright© 2000 - 2026 The Epoch Times Association Inc All Rights Reserved
  • Top Stories | The Epoch Times
    Listen to unbiased reporting free from the influence of any government, corporation, or political party Powered by The Epoch Times





中文字典-英文字典  2005-2009