In the mid-nineteenth century, chemists came to the conclusion that elements should be organized by their atomic weights. However, the atomic weights of various elements were calculated erroneously, and chemists also observed some anomalies in the properties of other elements. Over time, it became clear that the periodic table as currently comprised contained gaps, missing elements that had yet to be discovered. A rush to discover these missing pieces followed, and a seemingly endless amount of elemental discoveries were proclaimed and brought into laboratories. It wasn't until the discovery of the atomic number in 1913 that chemists were able to begin making sense of what did and what did not belong on the periodic table, but even then, the discovery of radioactivity convoluted the definition of an element further. Throughout its formation, the periodic table has seen false entries, good-faith errors, retractions, and dead ends; in fact, there have been more elemental discoveries" that have proven false than there are current elements on the table. The Lost Elements: The Shadow Side of Discovery collects the most notable of these instances, stretching from the nineteenth century to the present. The book tells the story of how scientists have come to understand elements, by discussing the failed theories and false discoveries that shaped the path of scientific progress. Chapters range from early chemists' stubborn refusal to disregard alchemy as legitimate practice, to the effects of the atomic number on discovery, to the switch in influence from chemists to physicists, as elements began to be artificially created in the twentieth century. Along the way, Fontani, Costa, and Orna introduce us to the key figures in the development of the periodic table as we know it. And we learn, in the end, that this development was shaped by errors and gaffs as much as by correct assumptions and scientific conclusions."
Assign the appropriate object, and check the answer on the next page. This beautiful book in a glossy cover will work well as a combination of learning and fun for children aged 3-6 It will also be a great gift idea for both boys and girls.
One of Italy's leading men of letters, a chemist by profession, writes about incidents in his life in which one or another of the elements figured in such a way as to become a personal preoccupation
"When Amelia is kidnapped by her sorcerer father, her friends find themselves with new elemental powers. They travel to Hawaii to rescue her, and save a trapped goddess."--Title page verso.
These fascinating tales follow every element on the table as they play out their parts in human history, and in the lives of the (frequently) mad scientists who discovered them.
Ocean's 11 meets Spy School in this hilarious illustrated middle-grade adventure series featuring the world's greatest tween geniuses.
Reproduction of the original: The Elements of Character by Mary G. Chandler
The Land of Lost Toys
Wu Hsin makes it abundantly clear; however, that this is a state of contracted energy, a sense of having lost something unnameable.
Into the Breach is a war of ideals, a war between living a good life and living an obedient life. Lliam Morgan takes the reader through adventure after adventure while unraveling our calling, not to be right, but to be obedient.
What if what you thought wasn't possible, actually was?Abby Claire was never one to believe in the fairy tales she was told as a child, much like many other seventeen year olds.