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Physical & Chemical properties

Appearance / physical state / colour

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Description of key information

Chlorine is a gas at room temperature. It has a greenish-yellow colour and a characteristic stringent odour. Chlorine occurs as a double atomic molecule - Cl2. It is 2,5 times heavier than air, In nature, chlorine occurs in its anionic form - Cl-.           

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
gaseous

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