GCSE Chemistry (AQA)

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Advanced Ionic Bonding Diagrams

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Bonding, structure, and the properties of matter Chemical bonds, ionic, covalent and metallic

Advanced Ionic Bonding Diagrams

5:13 Ionic Bonding Diagrams
Spec 4.2.1.2
Previous Metallic Bonding Next Representing Ionic Structure
  • Dot and cross diagrams can represent reactions with non-one-to-one ratios of metal and non-metal atoms.
  • Lithium and oxygen react to form lithium oxide (Li2O), requiring two lithium atoms for each oxygen atom.
  • In a dot and cross diagram, lithium atoms are represented with dots, and oxygen atoms with crosses.
  • Each lithium atom loses one electron, transferring them to the oxygen atom's outer shell.
  • Electron configurations may not be provided in exams, requiring calculation before drawing.
  • Multiple ions of the same type can be represented with a number in front of a bracket.
  • Drawing one lithium ion and writing "2" in front of the bracket is faster than drawing two separate ions.
  • This method is only applicable for ions at the end, not atoms at the beginning.
  • The reaction is shown with two lithium atoms reacting with one oxygen atom to form two lithium ions and one oxide ion.
  • Beryllium fluoride is another ionic compound example.
  • The chemical formula for beryllium fluoride is BeF2, determined using the swap and drop method.
  • Beryllium forms ions with a 2+ charge, and fluorine forms ions with a 1- charge.
  • Electron configurations for beryllium and fluorine are 2,2 and 2,7, respectively.
  • Dot and cross diagrams show one beryllium atom and two fluorine atoms.
  • Beryllium loses two electrons, transferring one to each fluorine atom.
  • Beryllium ion has a 2+ charge, and fluoride ions have a 1- charge.
  • Two fluoride ions are indicated with a "2" in front of the bracket.
  • The fluoride ion is distinct from the fluorine ion.
  • The full reaction is depicted with beryllium reacting with two fluorine atoms to form one beryllium ion and two fluoride ions.

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