= Radium
{title2=Ra}
{title2=88}
{title2=December 1989}
{wiki}
Discovered by <Marie Curie> when she noticed that there was some yet unknown more radioactive element in their raw samples, after <uranium> and <polonium>, which she published 6 months prior, had already been separated. Published on December 1989 as: <Sur une nouvelle substance fortement radio-active, contenue dans la pechblende>{full}.
The <uranium 238 decay chain> is the main source of naturally occurring <radium>.
\Video[https://www.youtube.com/watch?v=wAZX8sWSCqs]
{title=The epic story of radium by Institut de Radioprotection et de Sûreté Nucléaire (2013)}
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