Edexcel IGCSE Chemistry · Spec 1.38-1.40
Ion Charges, Ionic Formulae and Dot-and-Cross Diagrams
Covers recall the required ion charges, Construct neutral ionic formulae and Draw dot-and-cross diagrams for unequal ion ratios.
Chemistry revision video
Ion Charges, Ionic Formulae and Dot-and-Cross Diagrams
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Spec 1.38-1.40
What you need to know
- Recall the required ion charges
- Construct neutral ionic formulae
- Draw dot-and-cross diagrams for unequal ion ratios
Active recall
Quick check
Answer each question before opening the answer.
What charge does sulfate carry?
2-
What is the formula of aluminium oxide?
Al2O3
Why are brackets used in (NH4)2SO4?
Because more than one polyatomic ammonium ion is needed
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