6 understand how to use dot-and-cross diagrams to represent covalent bonds in:
• diatomic molecules, including hydrogen, oxygen, nitrogen, halogens and hydrogen
halides
• inorganic molecules including water, ammonia and carbon dioxide
• organic molecules containing up to two carbon atoms, including methane, ethane,
ethene and those containing halogen atom
DIATOMIC MOLECULE
|
CHARGE
|
HYDROGEN
|  |
OXYGEN
|  |
NITROGEN
|  |
FLUORINE
|  |
CHLORINE
|  |
BROMINE
|  |
IODINE
|  |
ASTATINE
|  |
s
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