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In addition, groups may be idenitifed by the first element in each group-so the Group 16 elements is sometimes called the oxygen group. There is considerable confusion surrounding the Group labels.
Ozone (O3) another naturally occuring form of oxygen. Each moleculehas 3 oxygen molecules. Colourless gas. Has a pungent odour. Poisonous, causing eye, nose and throat irritation and lung damage. Created when UV lights split oxygen molecules (Oâ) into single oxygen atoms. Single oxygen atoms join other oxygen molecules to form triplets of oxygen atoms, or ozone molecules (O3).