The Mystery of the Periodic Table by Benjamin Wiker
Surprisingly, Wendy Isdell wrote her book when she was in eighth grade! My son and I loved this book. It's a little bit like Alice in Wonderland except it's Julie in Mathland and the creatures are more helpful. Julie is transported to a land of math and science (after having a frustrating time doing algebra problems). On her quest to return home, AL the GEBRA (algebra) and his friends the Periodicals (horses with characteristics of the element they are named after) introduce Julie to the Land of Mathematics. On the way Julie learns about isotopes, travels through the Order of Operations, and eats fruit shaped like Bohr's model of the atom. This cute book gives accurate information about science and math concepts. It's a very pleasurable read.