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Calcium is readily complexed by oxygen chelates such as EDTA and polyphosphates, which are useful in analytic chemistry and removing calcium ions from hard water.In the absence of steric hindrance, smaller group 2 cations tend to form stronger complexes, but when large polydentate macrocycles are involved the trend is reversed.When finely divided, it spontaneously burns in air to produce the nitride.In bulk, calcium is less reactive: it quickly forms a hydration coating in moist air, but below 30% relative humidity it may be stored indefinitely at room temperature.Calcium is a chemical element with symbol Ca and atomic number 20.

It is the fifth most abundant element in Earth's crust and the third most abundant metal, after iron and aluminium.A calcium atom has twenty electrons, arranged in the electron configuration [Ar]4s.Like the other elements placed in group 2 of the periodic table, calcium has two valence electrons in the outermost s-orbital, which are very easily lost in chemical reactions to form a dipositive ion with the stable electron configuration of a noble gas, in this case argon.While calcium is a poorer conductor of electricity than copper or aluminium by volume, it is a better conductor than both of them by mass due to its very low density.The chemistry of calcium is that of a typical heavy alkaline earth metal.

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