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Excel A level chemistry paper 1 topics Questions and Answers
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40
December 2025
2025/2026
A+
Excel 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...
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