Key term
AQA GCSE Chemistry 8462
Atomic Structure and the Periodic Table
Topic overviewAtoms, elements and compoundsWord equations, symbols and balanced equationsMixturesFrom the plum pudding model to the nuclear modelBohr, Chadwick and the modern model of the atomRelative electrical charges of subatomic particlesSize and mass of atomsRelative atomic mass and electronic structureThe periodic tableDevelopment of the periodic tableMetals and non-metalsGroup 0Group 1Group 7Transition metals, and how they differ from Group 1
Bonding, Structure, and the Properties of Matter
Topic overviewChemical bonds, including metallic bondingIonic bondingIonic compoundsCovalent bonding and how it is representedThe three states of matter and changes of statePredicting state, state symbols, and the limits of the particle modelProperties of ionic compoundsProperties of small moleculesPolymers and giant covalent structuresProperties of metals and alloys, and why metals conductDiamond and graphiteGraphene and fullerenesSizes of particles and their propertiesUses of nanoparticles
Chemical Analysis
Chemical Changes
Topic overviewThe reactivity seriesMetal oxides, extraction, and redox in terms of electronsAcids reacting with metals, neutralisation and saltsSoluble saltsThe pH scale and neutralisationTitrationsThe process of electrolysis, and molten ionic compoundsUsing electrolysis to extract metalsElectrolysis of aqueous solutions
Chemistry of the Atmosphere
Topic overviewThe Earth's early atmosphereHow oxygen increased and carbon dioxide decreasedThe gases in today's atmosphere, and which are greenhouse gasesHuman activities which contribute to an increase in greenhouse gases in the atmosphereGlobal climate change and carbon footprintsAtmospheric pollutants from fuels, and their effects
Energy Changes
Organic Chemistry
Topic overviewCrude oil, hydrocarbons and alkanesFractional distillation and petrochemicalsProperties of hydrocarbonsCracking, and testing alkenes with bromine waterWhy cracking is useful, and equations for itStructure and formulae of alkenesReactions of alkenesAlcoholsCarboxylic acidsAddition polymerisationAmino acids, DNA and naturally occurring polymers
Quantitative Chemistry
The Rate and Extent of Chemical Change
Using Resources
Topic overviewUsing the Earth's resources and sustainable developmentProducing potable water in the UKDesalination, and analysing water samplesWaste water treatmentLife cycle assessmentWays of reducing the use of resourcesCorrosion and its preventionAlloys as useful materialsGlass, clay ceramics and polymersComposites, and comparing materialsThe Haber processProduction and uses of NPK fertilisers
Atomic Structure and the Periodic Table
Size and mass of atoms
- 3 things to know
- Paper 1
Overview
The radius of an atom and of its nucleus, where the mass of an atom is concentrated, the relative masses of protons, neutrons and electrons, mass number and isotopes, reading atomic notation, counting protons, neutrons and electrons in atoms and ions, and estimating at atomic scale.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
What are isotopes?
Key term
When an atom is written using its symbol, where are the mass number and the atomic number placed?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is the approximate radius of an atom in nanometres?
Model answer
About 0.1 nm.
- 2
What is the approximate radius of an atom in metres?
Model answer
About 1 × 10⁻¹⁰ m.
- 3
What is the approximate radius of a nucleus in metres?
Model answer
About 1 × 10⁻¹⁴ m.
- 4
How does the radius of a nucleus compare with the radius of the whole atom?
Model answer
It is less than one ten-thousandth of the radius of the atom.
- 5
Where is almost all of the mass of an atom found?
Model answer
Almost all of it is in the nucleus.
- 6
What is the relative mass of a proton?
Model answer
It is 1.
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