L9. Formation of positive and negative ions

• Chem
• Secondary Education

Lesson 9

Formation of positive and negative ions

Formation of ionic compounds

04-10-2022

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• draw a dot-and-cross diagram showing the formation of : cations and anions, as well some ionic substances

Success Criteria

• formation of ions
• formation of ionic bonds (Metal + Nonmetallic)
• dot-and-cross diagram

Main Concepts

Language 

development

• ions 
• anion
• cation
• electrostatic forces
• ionic bonding

Know the keywords

• Draw atom diagrams and electron configurations of sodium and chlorine atoms.
• Show the transfer of the outermost electron from sodium to chlorine.
• Write down the new electron configurations for resulting ions.
• Write down their charges.
• Explain that each ion attained a noble gas structure (example: Na+ is isoelectric with neon.)
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Steps in diagramming

Practice Activity

• Pair work
• Show the formation of: MgO, CaCl2, and Li2O. Choose 2 ONLY.

• Wednesday - Physical properties of ionic compounds
• Thursday - NO SCHEDULED CLASS
• Friday - Giant covalent structures

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