Radium
= Radium
{title2=$\mathrm{Ra}$}
{wiki}
<Radium> is the <chemical element> with <atomic number> 88 and symbol $\mathrm{Ra}$. It is a <alkaline earth metal>. All its <isotopes> are radioactive. Its chemistry resembles that of <barium>, often favoring the $+2$ state, while radioactive decay distinguishes its long-term behavior from an ordinary stable alkaline-earth salt.<Periodic Table by Royal Society of Chemistry>[Radium, element data and uses]{ref}