Nuclear atom and isotopes — WJEC GCSE Physics
In summary: Nuclear atom and isotopes is a key topic in WJEC GCSE Physics. Key exam tip: Ensure you can clearly describe the transition from the plum pudding model to the Bohr model
Exam Tips for Nuclear atom and isotopes
- Ensure you can clearly describe the transition from the plum pudding model to the Bohr model
- Practice calculating the number of protons, neutrons, and electrons for various isotopes using atomic notation
- Be prepared to state the order of magnitude for the size of atoms and nuclei
Common Mistakes
- Confusing the relative sizes of the nucleus and the atom
- Incorrectly identifying the charge of subatomic particles
- Failing to distinguish between atomic number and mass number in isotope notation
Marking Points
- Description of the atom as a positively charged nucleus surrounded by negatively charged electrons
- Recognition that the nuclear radius is much smaller than the atomic radius
- Understanding that almost all mass is concentrated in the nucleus
- Identification of protons and neutrons as nuclear components
- Definition of isotopes as atoms of the same element with different numbers of neutrons
- Correct use of atomic notation (A/Z X) to represent isotopes
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