Edexcel IGCSE Chemistry

Revision Notes

1.6.2 Common Ions

Common Ions

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 fewer than four electrons, donate electrons and atoms that have more than 4 electrons, receive electrons)
  • Atoms that gain electrons become negative ions and atoms that donate electron forms positive ion
  • You also need to learn the formula of compound ions, that is, ions made from more than one element

The Charges of Common Positive Ions Table

Common Positive Ions 1, downloadable IGCSE & GCSE Chemistry revision notesCommon Positive Ions 2, downloadable IGCSE & GCSE Chemistry revision notes

The Charges of Common Negative Ions Table

Common Negative Ions, downloadable IGCSE & GCSE Chemistry revision notes

Author: Francesca

Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.

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