How the radioactive decay depends on total mass of the element?

how the decay depends on total mass of the radioactive element?
is it necessary that all the atoms of the element keep contact among them, for the above case?
 

tiny-tim

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Hi sanjibghosh! :smile:

If there's no chain reaction, then the atoms decay independently, and so it doesn't matter where the individual atoms are :wink:
 
ok ,when the atoms decay independently then they follow simple probability rule (?).
 

tiny-tim

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thank you 'tiny-tim'
 
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In the case of beryllium 7 (proton rich nucleus), which decays by the capture of an atomic electron from the K-shell (53 day half life), the lifetime can be changed slightly by putting it in different environments. or by putting it in a crystal lattice.
 
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