Nitrogen (N₂) (basic)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Carbon dioxide (CO₂) (beginner)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Carbon monoxide (CO) (beginner)

Colourless, odourless gas, highly toxic to humans and animals in high concentration.

Oxygen (O₂) (beginner)

A colourless, odourless gas, an important component of the atmosphere, indispensable to...

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