Electronic configuration and the periodic table

The resource is a group activity for 3 students based on the patterns in electronic configuration for the first 20 elements and their positions in the periodic table. Suitable for Years 9 and 10. Once each group has completed their periodic table they should be asked to look for any patterns they observe. You could extend the 10's by asking them to predict the number of shells and valence electrons for other elements in the table. It is an interesting start to the question 'what about the transition elements?'