Stable atoms have as many electrons as they do protons. How do these electrons orient themselves around the nucleus? They fill their electron orbitals by the aufbau principle.: The Aufbau Principle - Using the Aufbau Principle
COM: Great gift idea for the 'science nerd' in your life. Spelling with Elements: Cool website that spells out any word using the periodic table of elements. Then order posters, mugs, t-shirts, etc as a unique gift.
8 Interactive Periodic Table with Names -- Chemistry Learning Tools for Kids