Key term
AQA GCSE Combined Science Physics 8464
Atomic Structure
Topic overviewThe structure of an atomMass number, atomic number and isotopesFrom the plum pudding model to the nuclear modelChadwick, the neutron, and comparing the modelsRadioactive decay and nuclear radiationNuclear equationsHalf-lives and the random nature of radioactive decayRadioactive contamination
Electricity
Topic overviewCircuit symbols, electrical charge and currentCurrent, resistance and potential differenceOhmic conductors, filament lamps, diodes and thermistorsLight-dependent resistors, and investigating resistanceCurrent and potential difference in series and parallelConstructing circuits, and calculating in series circuitsDirect and alternating potential difference, and mains electricityPower and efficiencyAppliances, and the energy transferred by electrical workPower, and the power ratings of domestic appliancesThe National Grid
Energy
Forces
Topic overviewScalars, vectors, forces and the resultant forceGravityWork done and energy transferStretching, compressing, and the spring constantLinear and non-linear extension, and work done on a springDistance, displacement and speedThe speed of sound, and the distance-speed-time equationVelocity and the distance-time relationshipAcceleration, deceleration and velocity-time graphsArea under a velocity-time graph, and the uniform acceleration equationNewton's First LawNewton's Second and Third LawsStopping distance and reaction timeFactors affecting braking distanceBraking force, deceleration and the dangers of stopping quickly
Magnetism and Electromagnetism
Particle Model of Matter
Atomic Structure
The structure of an atom
- 3 things to know
- Physics Paper 1
Overview
The radius of an atom and why atoms cannot be seen with a light microscope, the nucleus of protons and neutrons and its charge, electrons and their charge, the size of the nucleus and where the mass is concentrated, why an atom is mostly empty space, and how electrons sit in energy levels and move when an atom absorbs or emits electromagnetic radiation.
What you need to know
Answer each one before you reveal it.
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Key term
Describe the basic structure of an atom.
Key term
Which two types of particle are found in the nucleus of an atom?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is the approximate radius of an atom?
Model answer
About 1 × 10⁻¹⁰ m.
- 2
Explain why individual atoms cannot be seen using a light microscope.
Model answer
An atom has a radius of only about 1 × 10⁻¹⁰ m, which is far smaller than the wavelength of visible light.
- 3
Describe the basic structure of an atom.
Model answer
A positively charged nucleus made of protons and neutrons, surrounded by negatively charged electrons.
- 4
Which two types of particle are found in the nucleus of an atom?
Model answer
Protons and neutrons.
- 5
What is the overall charge on the nucleus of an atom, and why?
Model answer
It is positive, because it contains positively charged protons and neutrons that carry no charge.
- 6
Where in an atom are the electrons found?
Model answer
Surrounding the nucleus, outside it.
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