Specification Point 1.37:
Understand how ions are formed by electron loss or gain
How Ions are Formed
An ion is an electrically charged atom or a group of atoms that are formed by the loss or gain of electrons.
- This loss or gain of electrons leave a full outer shell of electrons.
- The electronic structure of an ion will be the same as that of a noble gas – such as Helium, Neon and Argon.
Ionisation of metals and non-metals:
- Metals: They will lose electrons to another atom and become positively charged ions
- Non-metals: They will gain electrons from another atom to become negatively charged ions
Positively charged sodium and aluminium ions
Negatively charged oxide and chloride ions
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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.
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