Colourless gaseous element that forms 78% of the air by volume
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Related clues
- Gas making up four fifths of the atmosphere
- Colourless gas used as a refrigerant in liquid form
- Chemical element of atomic number 7
- The air's 'saltpetre-forming' non-toxic gaseous element that makes no fumes and which, despite its former 'lifeless' name 'azote', is vital to all life, from animals to legumes
- This is odorless, colorless and tasteless
Possible answers
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