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24 May 2010

4 January 2010

  • 05:5905:59, 4 January 2010 diff hist +898 N File:Promethium.jpgPromethium is the second element after technetium, of which no stable isotopes exist. However, it is much more unstable than this, the most long-lived isotope, 145Pm, has a half-life of just under 18 years. The only natural isotope, 147Pm, has a half-life

12 May 2009

24 April 2009

18 April 2009

17 April 2009

10 March 2009

4 March 2009

3 December 2008

25 November 2008

24 October 2008

22 October 2008

20 October 2008