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Year 10 - Science

Forming ions for ionic bonding (RAM 1 d.p.)

Structure and bonding

Unit Summary

This unit explores changes of state, particle kinetics, and energy transfers in relation to chemical bonding, including ionic, covalent, and metallic bonds. It examines carbon's unique bonding properties, leading to organic compounds and materials like diamond, graphite, fullerenes, and graphene.

Lesson Summary

You will learn to use electron configuration diagrams (and notation) to explain how positive and negative ions are formed for ionic bonding.

Key Notes

  • Atoms are more stable when they have a full outer shell.
  • Metal atoms become more stable when they lose the electron(s) in their outer shell, and become positive ions (cations).
  • Non–metal atoms become more stable when they gain electrons to fill their outer shell and become negative ions (anions).
  • Ions form through the loss or gain of electrons.
  • Standard ion notation uses superscript charge values where the charge follows the number (e.g. 2+, not +2).

Vocabulary To Learn

  • ion: An atom or molecule that has lost or gained one or more electrons so has a charge.
  • cation: A positively charged ion.
  • anion: A negatively charged ion.
  • dot–and–cross diagram: Used to show how chemical bonds are formed between atoms – the electrons from one atom are shown as dots and the electrons from the other atom are shown as crosses.

Common Mistakes To Avoid

  • Ions are not formed because atoms 'want' or 'need' a full outer electron shell. Pupils often find standard notation difficult and get confused about when to use superscript and subscript.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Atoms are more stable when they have a full outer shell. Metal atoms become more stable when they lose the electron(s) in their outer shell, and become positive ions (cations).

2. Define this scientific word and use it in context. 'ion'

An atom or molecule that has lost or gained one or more electrons so has a charge. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Ions are not formed because atoms 'want' or 'need' a full outer electron shell. Pupils often find standard notation difficult and get confused about when to use superscript and subscript. Correction: It is important that pupils understand that atoms do not have 'wants' or 'needs'. Emphasise that the driving force for the formation of atoms is an increase in stability when the outer electron shell is full.

More Lessons In This Unit

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