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GCSE Physics · key term
A group of two or more atoms joined together.
Used by Edexcel and OCR
Specification 6.2 · Paper 1
A particle made from two or more atoms chemically bonded together.
Revise: Atomic SizeWhen atoms join by chemical bonds, they can form molecules. Their dimensions are so small that writing them as ordinary decimals is inconvenient, so powers of ten are used instead.
Specification P1.1c, P1.1e · Paper 1 (Foundation), Paper 3 (Higher)
A group of two or more atoms joined together; a small molecule has dimensions comparable to the scale of atoms.
Revise: Size of atomsMatter is made from particles such as atoms and molecules. An atom is a basic particle of an element, whereas a molecule consists of atoms joined together. These are not the same as subatomic particles, such as electrons, protons and neutrons, which are parts of atoms.
A group of two or more atoms joined by chemical bonds.
Paper 1, Paper 2
Revise: Atomic Interactions and Generation of RadiationWhat happens depends on the energy transferred and on which part of the atom or molecule interacts with the radiation.
State both the power of ten and the unit: atoms and small molecules are typically of order .
“Order of magnitude” asks for the approximate scale, not an exact measurement for every atom or molecule.
Do not describe every atom or small molecule as exactly ; this is a typical scale.
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