Writing electron configurations
Below is a video lesson on writing electronic configurations up to Krypton.
And here is a short video explaining how to write configurations for ions.
Finally, in the extension video below, we give you tips on memorising parts of the periodic table, and their electronic configurations.
Kene made an incorrect statement here. The IB WILL hold you responsible for the main level configurations (e.g. 2,8,8,2 for calcium). So you should learn to reproduce these.