Ytterbium
= Ytterbium
{title2=$\mathrm{Yb}$}
<Ytterbium> is the <chemical element> with <atomic number> 70 and symbol $\mathrm{Yb}$. It is a <lanthanide>. It has important $+2$ and $+3$ chemistry. Its narrow optical transitions are useful in precision atomic experiments, showing how a chemical element can also provide a highly reproducible spectroscopic reference.<Periodic Table by Royal Society of Chemistry>[Ytterbium, element data and uses]{ref}