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- Newsgroups: sci.chem
- Path: sparky!uunet!world!moroney
- From: moroney@world.std.com (Michael Moroney)
- Subject: Re: Technetium
- Message-ID: <C18p0q.1yC@world.std.com>
- Keywords: nucleon shell model proton electron pairing magic numbers
- Organization: The World Public Access UNIX, Brookline, MA
- References: <staff.02r1@rabbit.augs.se> <C0zK8D.Bu1@world.std.com> <staff.02ri@rabbit.augs.se> <C14nyC.Fyp@world.std.com> <1993Jan21.153756.19628@husc15.harvard.edu>
- Date: Fri, 22 Jan 1993 05:10:01 GMT
- Lines: 30
-
- blom@husc15.harvard.edu writes:
-
- >In article <C14nyC.Fyp@world.std.com>, moroney@world.std.com (Michael Moroney) writes:
-
- >2,8,20,28,50,82,and 126 turn out to be "magic" numbers. Nucleii with this
- >number of either protons or neutrons are exceptionally stable. Nucleii with
- >a magic number of protons and a magic number of neutrons are even more stable.
-
- >To previous poster: Element 126 is the one, I believe, which is expected to be
- >very stable. (Rather than 114, although that might come pretty close.) By
- >really stable people mean "as stable as Radium" or so, although who knows? It
- >might not be radioactive... Ha.
-
- I dug up the chemistry book I mentioned (Chemical Principles Dickerson,
- Gary, Haight), and it mentions Element 114 and not 126 as the next magic
- number. Specifically element 114 with mass number 298 might be "relatively
- stable", as 184 (298-114) is also a magic number. Now elsewhere they have a
- little drawing showing nuclear stability, with number of neutrons on the
- X axis, number of protons on the Y axis, and "relative stability" on the
- Z axis. There's a band showing the isotopes, with magic number nuclei being
- generally "higher", double magic numbers more so. The magic numbers are
- indicated on the proton and neutron axes, but get this - they aren't
- the same past 82. For neutrons, the numbers shown are 28, 50, 82, 126,
- 184, 196. For protons, 28, 50, 82, 114.
-
- So either the magic numbers are not the same or this book is all messed up.
- Regardless, it would be interesting to see what happens when elements
- #114 and #126 are attempted to be made.
-
- -Mike
-