Specification Point 1.38:
Know the charges of these ions:
  • metals in Groups 1, 2 and 3
  • non-metals in Groups 5, 6 and 7
  • Ag+, Cu2+, Fe2+, Fe3+, Pb2+, Zn2+

Ion Charges

How to deduce the charge of an ion:

  • Find the number of electrons in the outer electron shell.
  • Find out if it is easy for the atom to gain electron or to donate electron. (in most cases atoms that have below four electrons, donate electrons and atoms that have above 4 electrons, receive electrons)
  • Atoms that gain electron become negative ion and atoms that donate electron forms positive ion

Charges of Positive Ions:

Positive Ion charges table, IGCSE & GCSE Chemistry revision notes

Charges of Negative Ions:   

Negative Ion charges table, IGCSE & GCSE Chemistry revision notes

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.