Learn about the periodic table and the 118 elements. Take a quiz and memorize useful equations on the back side. Covers chemistry essentials like: How to find the Mass Number; What happens when you remove a Proton from an Atom; What is the Atomic Number: and much, much more! MADE IN USA Safety-Approved Award Winning Anti-bacterial - Wash with dish soap; placemats dry quickly. Use dry erase or washable markers. Kids can also wipe clean with paper towel or eraser. A spray bottle is fun too! Used in homes, schools and on the go,travelling or in a restaurant. Age Recommendation: 2 - 6 Lightweight and durable. Dimensions: 17.5" x 11.5"