edp@jareth.enet.dec.com (Eric Postpischil (Always mount a scratch monkey.)) (11/02/90)
According to the Periodic Table, the mass number of Unnilpentium is 261. Shouldn't that be 262? -- edp
dove@ucscb.UCSC.EDU (Ray Rischpater) (11/06/90)
In article <16888@shlump.nac.dec.com> edp@jareth.enet.dec.com (Eric Postpischil (Always mount a scratch monkey.)) writes: >According to the Periodic Table, the mass number of Unnilpentium is 261. >Shouldn't that be 262? > -- edp Wow! You're absolutely right, checking my 68th ed CRC. Good eyes? However did you notice >that<? -- -- dove@ucscg.ucsc.edu Ray Rischpater -- dove@ucscb.ucsc.edu (408) 426-0716 --As usual, all of the opinions contained herein are my own...
sgothard@hpdmd48.boi.hp.com (Steve Gothard) (11/06/90)
As I understand it both Unnilpentium(261) and Unnilpentium(262) have been synthesized with isotope 261 having a half life of around 1.8s and isotope 262 having a half life of around 40s. I suppose most periodic tables show 262 since it has the longest half life. Since I am not a chemist this is just my own unqualified opinion. I am sure someone else could give a better explanation.
alexw@miracle.intel.com (Alex Witkowski) (11/07/90)
I believe the atomic weight on the periodic table is a weighted average
of all the various isotopes. They are weighted by their relative abundance.
I don't know what they do for elements which do not naturally occur.
-------------------------------------------------------------------------------
Alex Witkowski
Intel Corporation internet: alexw@t12sys.intel.com
Santa Clara, CA 95051 uucp: ...!{decwrl|hplabs!oliveb}!intelca!t12sys!alexw