A colourless, odourless, gaseous element that forms 78 per cent of the air
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Related clues
- Element that forms 78% by volume of the air
- Most common atmospheric gas
- 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
- Constituent of air
- Main gas found in Earth's atmosphere
Possible answers
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