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GCSE Chemistry · key term
The size of something in comparison with another object or a chosen unit of measurement.
Used by Edexcel and OCR
Paper 1, Paper 2
Revise: Mathematical ApplicationsAtomic radii and the lengths of many chemical bonds are around this scale.
A scale showing how large or small something is by comparing its dimensions with a known length or with other objects.
The relationship between a length in a representation and the corresponding length of the object represented.
Specification CM2.3ii, CM2.3iii · Paper 1 (Foundation), Paper 3 (Higher)
The size of something in relation to other objects or to a chosen unit of measurement.
Revise: Atomic Scale RelationsAtoms are the particles from which elements are made, but their size is far below the scale that we can see directly. An everyday ruler marked in centimetres or millimetres is therefore unsuitable for measuring an individual atom.
The typical range of sizes associated with an object or particle.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The size of something in comparison with another object or a chosen unit.
Revise: Size and scale of atomsFor questions about scale, the important idea is the approximate size and how it compares with other particles.
A measure of how large or small something is compared with another object or a stated length.
Treat scale comparisons as approximate: an atom has no sharp outer edge, so its measured size depends on how it is defined.
Do not describe an atom as simply “too small to see”. Give a numerical scale or a meaningful comparison where possible.
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