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Atoms, elements and molecular models

DIFFICULTYintrostandardchallenge
QUESTION TYPEMix of allChange
Classify the helium specimenRead oxygen connectionsPreserve symbol caseCount atoms within moleculesNOWMix of allRecommended

This is a fixed question bank. Later sets may repeat these questions

Question 1 of 4

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Each connected pair in this oxygen model is one molecule

Selected model of oxygen in a turned spatial view; symbols identify atoms and lines show connections Oxygen. Spatial ball-and-stick model. Turned view. Three oxygen molecules. Each contains two oxygen atoms joined by a double bond. Schematic, not to scale. Sphere sizes, spacing and the selected sample count do not describe a bulk substance. Lines model bonds, not physical sticks. Views preserve the same atoms, molecules and bonds; changing view is not a reaction. This is not an electron-cloud image, microscope image or state simulation.OxygenSpatial ball-and-stick modelOOOOOOTurned view; same specimenO = oxygenLines: bonds; paired lines: double bondsSchematic, not to scaleSizes and spacing are model conventionsSelected sample only, not a bulk count

Symbols identify the atoms; colours are a key, not observed atom colours. Sizes, spacing and sample population are schematic, not to scale or a bulk measurement. Lines represent bonds, not physical sticks. This is not a state, density or electron-cloud model

1 mark

Which description matches the atom identities and connections?