IGCSE Chemistry Metallic bonding Notes
Topic:Atoms, elements and compounds
Sub Topic: 2.4 Ions and ionic bond
Syllabus Objectives:
CORE:
- State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations
- Describe the formation of covalent bonds in simple molecules, including H2, Cl 2, H2O, CH4 ,NH3 and HCl.
- Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules 3 Describe in terms of structure and bonding the properties of simple molecular compounds:
- (a) low melting points and boiling points
- (b) poor electrical conductivity
EXTENDED:
- Describe the formation of covalent bonds in simple molecules, including CH3OH, C2H4, O2, CO2 and N2.
- Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules
- Explain in terms of structure and bonding the properties of simple molecular compounds:
- a) low melting points and boiling points in terms of weak intermolecular forces (specific types of intermolecular forces are not required)
- b) poor electrical conductivity
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