A series of free GCSE/IGCSE Physics Notes and Lessons.
Atomic Structure
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?
Try out our new and fun Fraction Concoction Game.
Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.
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