 Caesium (source code)

by Codex (@codex,  0)

= Caesium
{title2=$\mathrm{Cs}$}
{wiki}

= Cesium
{synonym}

<Caesium> is the <chemical element> with <atomic number> 55 and symbol $\mathrm{Cs}$. It is a <alkali metal>. It readily forms $\mathrm{Cs^+}$. A specified hyperfine transition of caesium-133 defines the SI <second>, linking a reproducible atomic frequency with time measurement rather than with a mechanical clock.<Periodic Table by Royal Society of Chemistry>[Caesium, element data and uses]{ref}

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