Calcium carbonate (CaCO₃)

Calcium carbonate (CaCO₃)

Limestone is a widely and diversely used material.



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Carbonate ion (CO₃²⁻)

A compound ion produced from carbonic acid by releasing protons.


Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.

Benzoic acid (C₆H₅COOH)

The simplest of the aromatic carboxylic acids.

Carbon dioxide (CO₂) (intermediate)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Carbon monoxide (CO) (intermediate)

Colourless, odourless gas, highly toxic to humans and animals in high concentration.

Carbonic acid (H₂CO₃)

Colourless, odourless liquid produced by dissolving carbon dioxide in water.

Covalent bonds in benzene molecules

In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.

Electron configuration of calcium

This animation shows the electron configuration of the calcium atom.

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