Edexcel IGCSE Chemistry · Spec 1.14-1.17
Atomic Structure & Isotopes
The structure of the atom, atomic number and mass number, and isotopes.
Chemistry revision video
Atomic Structure & Isotopes
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Spec 1.14-1.17
What you need to know
- Describe the particles that make up an atom
- Use atomic number and mass number
- Explain what isotopes are, and work out a relative atomic mass
Active recall
Quick check
Answer each question before opening the answer.
State the relative charge and relative mass of a proton, neutron and electron.
Proton: charge +1, mass 1. Neutron: charge 0, mass 1. Electron: charge −1, mass negligible (~1/1836).
What are isotopes?
Atoms of the same element (same number of protons) with different numbers of neutrons.
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