As we’ve just finished looking at electronic structure I found a beauty of a periodic table showing all the electron shells for all of the elements in the periodic table as “dot & cross” diagrams. Great for showing what happens after Calcium!
You can see clearly on this how the transition metals start to fill up an inner shell rather than the outer shell. This explains a lot of their chemistry later!
(You might need to download this to view it properly, just click on the image above to view it full size)