Atoms and elements, concept map, year 8, science

1. 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.

2. 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