Re: [Phys-l] question on radioactivity of Tc and Pm

[Brian Whatcott <betwys1@sbcglobal.net>]

At 12:25 AM 3/5/2007,  Eric Scerri, you wrote:


> I would be interested to learn why these two elements are radioactive
> even though they have relatively low atomic numbers.
>
> This is true of Tc especially, for which Z = 43.
> For Pm Z = 61.
>
> Subsequent elements are not radioactive until one reaches Po (Z =84)
> and all subsequent elements.
> What is special about Tc and Pm ?
>
>
>
> regards,
> eric scerri


Without pausing to weigh the merits of the old aphorism about
 fools rushing in, I merely note that there is no element without
 a radioactive form, as a sweeping generalization.



Brian Whatcott    Altus OK    Eureka!