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Examen
Excel A level chemistry paper 1 topics Questions and Answers
NuevoExcel A level chemistry paper 1 topics Questions and Answers 
Atoms 
Made up of 3 subatomic particles - electrons, neutrons and protons 
 
 
 
Electrons 
- Subatomic particle 
- Charge of -1 
- Arranged in orbitals 
- Relative mass of 0.0005 - negligible 
 
 
 
Nucleus 
- Where most of the mass of the atom is contained 
- Made up of protons and neutrons 
- Diameter is much smaller than that of whole atom 
 
 
 
Neutrons 
- Subatomic particle 
- No charge 
- Relative mass of 1 
- Contained in nuc...