Calcium (source code)
= Calcium
{title2=$\mathrm{Ca}$}
{wiki}
<Calcium> is the <chemical element> with <atomic number> 20 and symbol $\mathrm{Ca}$. It is a <alkaline earth metal>. Its common ion is $\mathrm{Ca^{2+}}$. Calcium in <calcium carbonate> or a biological signaling system is present in chemically bound or solvated forms, rather than as elemental metal; this distinction is essential when connecting mineral and biological chemistry.<Periodic Table by Royal Society of Chemistry>[Calcium, element data and uses]{ref}
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