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Q: elements of atomic number <84 with no stable isotopes ( Answered,   0 Comments )
Subject: elements of atomic number <84 with no stable isotopes
Category: Science > Physics
Asked by: haroldb-ga
List Price: $10.00
Posted: 08 Mar 2006 03:15 PST
Expires: 07 Apr 2006 04:15 PDT
Question ID: 704864
Why are technetium (atomic no. 43) and promethium (61) alone among the
elements of atomic number less than 84 (whoops - got this wrong last
time) in having no stable isotopes?
Do they have an 'unstable' number of protons in their nuclei?
Subject: Re: elements of atomic number <84 with no stable isotopes
Answered By: hedgie-ga on 09 Mar 2006 01:23 PST
It is a similar reason to periodic table of element:
Nucleus with 'closed shell' of nucleons is more stable,
corresponding to 'noble gas' elements.

 explanation of how neutrons and protons within atomic nuclei are structured.
Called the "nuclear shell model," her work explains why the nuclei of some
atoms are more stable than others and why some elements have many different
atomic forms, called "isotopes," while others do not. For this work, she
shared the 1963 Nobel Prize in physics

More technical details ( jj-coupling shell model)

Still more technica

Search Terms: magic numbers, shell model, nucleus
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