Electron shells for first 20 elements

This is a worksheet I've assembled and used with classes in BTEC and GCSE. I've added two image from google image search which helped me explain the overflowing effect when drawing electrons (the class imagined a fountain filling up for the first time). I hope they help! This specifically was my evidence for BTEC 'Assignment 1.3 P3 Describe the atomic structures of elements 1-20, found in the periodic table'.