Colourless, odourless gaseous element that forms 78 per cent of the air
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Related clues
- Main gas found in Earth's atmosphere
- From 'generate', a gas important for plant growth, atomic no. 7
- A colourless, odourless gas that produces ammonia when reacted with hydrogen
- The weird ringtone is gas
- Referred to by Antoine Lavoisier as azote, chemical element, atomic number 7 that is essential to life
Possible answers
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