Atoms And Elements

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Atoms and elements
For the teacher – first slide shows the whole concept map the second slide shows a developing map to be used in teaching the ideas contained in the map when downloaded.
All shown on the:
Some were known in ancient times but many others were discovered in the last century
When known?
Represented by
Elements
Symbols
All particles are identical
Examples
H = Hydrogen
He = Helium
Hg = Mercury
Atoms
Represented in models
Chemical formula – in this example ethanol is C2H5OH
This is a model of ethanol
Represented by
Contains : 2 x carbon atoms (black) + 1 x oxygen atom (red) + 6 x hydrogen atoms (white)
Materials like this are called
Compounds