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2014-11-29T08:56:25+05:30

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It is due to the ratio of number of neutrons to number of protons in the nucleus.  It this ratio crosses a certain limit then radio activity triggers off.

The nucleus is so closely packed with so many particles that the repulsive forces start dominating the attractive forces.


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2014-11-30T17:12:50+05:30
Radioactive elements lie after at.no of 80 due to the ratio of number of neutrons to number of protons in the nucleus.  
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