Ionic diagrams for binary ionic substances
I can draw dot and cross diagrams for binary ionic compounds.
- Year 10
- AQA
Ionic diagrams for binary ionic substances
I can draw dot and cross diagrams for binary ionic compounds.
Lesson details
Key learning points
- Dot and cross diagrams as a model for binary ionic substances
- Dot and cross diagrams show the empirical formula/ratio of atoms to show how electrons are transferred
- Ions are shown with full outer shells, square brackets, and a charge in the top right corner.
- Ionic compounds are neutral overall, so positive and negative charge must balance.
- When positive ions do not have the same magnitude of charge as negative ions, multiple of some ions will be required.
Keywords
Binary ionic substance - is made up of two different elements, one of which is a metal and the other a non-metal element.
Empirical formula - show the simplest whole number ratio of atoms of each element in a compound.
Ratio - can be used to determine the size of one quantity in relation to another.
Dot-and-cross diagram - is 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.
Magnitude - is the size of a quantity, for example the size of the charge on the ion.
Common misconception
The ionic bond is the transfer of electrons and not the electrostatic forces of attraction between the ions. Dot and cross diagrams show the empirical formula of the lattice and not an ionic molecule.
Ensure students have a good understanding of how ions are formed, the arrangement of ions in a giant lattice structure and empricial formula before moving on to disucss using dot and cross diagrams to model ionic bonding.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Magnesium is in Group 2 of the periodic table. Which of the following statements about magnesium ions are correct?
Q2.Oxygen is a non-metal. What name is given to the type of ions that oxygen forms?
Q3.Which of the following symbols represents a sodium ion?
Q4.True or false? Bromine atoms form stable Br⁻ ions.
Q5.Neon is found in Group 0 of the periodic table. Why is neon unreactive?
Q6.An element has atoms containing 20 electrons. Which of the following statements about the element are true?
Assessment exit quiz
6 Questions
Q1.Match the following terms to the correct definition.
Q2.Aluminium atoms three electrons to form aluminium ions.
Q3.Which of the following are binary ionic substances?
Q4.This is a dot and cross diagram showing the bonding between sodium and chlorine. Which of the following statements about the image are correct.
