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GCSE Combined Science · key term
Existing as single atoms rather than atoms bonded together in molecules.
Used by AQA and Edexcel
Specification 5.1.2.4 · Paper 3
Revise: Group 0 Noble GasesUnlike gases such as oxygen, whose atoms are joined in molecules, noble gases exist as separate, single atoms. This is called being monatomic: helium gas contains He atoms, not He₂ molecules.
Specification Group 0 · Paper 3, Paper 4
Existing as separate single atoms rather than molecules.
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Going down the group, they include helium, neon, argon, krypton, xenon and radon. They are colourless, non-flammable gases at room temperature and are monatomic: their particles are individual atoms, not molecules made from joined atoms.