radio activity


by assassinsdoc
Tags: activity, radio
assassinsdoc
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#1
Oct31-13, 08:19 AM
P: 7
Why c - 14 is radio active though n/p ratio is less than 1.5?
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UltrafastPED
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#2
Oct31-13, 09:26 AM
Thanks
P: 1,348
There is no "magic rule"; see the article on "nuclear drip line": http://en.wikipedia.org/wiki/Nuclear_drip_line
dauto
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#3
Oct31-13, 10:10 AM
P: 1,273
That is not a rule. Most radioactive elements do not have n/p > 1.5. That's a myth

dauto
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#4
Oct31-13, 10:17 AM
P: 1,273

radio activity


Do not confuse the statement "There are no stable nuclei with n/p > 1.5" with the statement "All unstable nuclei have n/p > 1.5". See the difference? The first one is true. The second one most definitely isn't.
mfb
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#5
Oct31-13, 06:43 PM
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P: 10,853
Quote Quote by dauto View Post
Do not confuse the statement "There are no stable nuclei with n/p > 1.5" with the statement "All unstable nuclei have n/p > 1.5". See the difference? The first one is true. The second one most definitely isn't.
Lead-207 is (experimentally1) stable with 82 protons and 125 neutrons, 125/82=1.524.
There are a few other examples, see the linked list.
dauto
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#6
Nov1-13, 09:23 AM
P: 1,273
Quote Quote by mfb View Post
Lead-207 is (experimentally1) stable with 82 protons and 125 neutrons, 125/82=1.524.
There are a few other examples, see the linked list.
That's exactly my point. This rule is just an approximate rule of thumb...
assassinsdoc
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#7
Nov6-13, 07:47 AM
P: 7
thank you!
I've studied in class about something called 'magic numbers' where nuclei having 2, 8, 20, 28, 50, 82 or 126 protons or neutrons or both (seperately) are exceptionally stable compared to their respective neighbouring nuclides. So, they too make an exception.
mfb
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#8
Nov6-13, 08:21 AM
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P: 10,853
That's right.


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