IGCSE Physics Lessons
A series of free GCSE/IGCSE Physics Notes and Lessons.
Radius of atoms and the nucleus
Electrons and energy levels
How electrons can move energy levels when an atom absorbs electromagnetic radiation?
Atomic and Mass numbers
How to use the atomic and mass numbers for an element to work out the numbers of protons, neutrons and electrons?
What is meant by isotopes and ions?
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