Period 6 element the last stable element; all subsequent elements are radioactive. For bismuth, however, its only primordial isotope, Bi, has a half-life of more than 10 years, over a billion times longer than the current age of the universe. As a rule, period 6 elements fill their 6s shells first, then their 4f, 5d, and 6p shells, in that order; however, there are exceptions, such as gold. This period contains the lanthanides, also known as the "rare earths". Many lanthanides are known for their magnetic properties, such as neodymium. Many period 6 transition metals are very valuable, such as gold, however many
The Unbeheaded King Xylar and Othomae. As usual, the political constraints under which the protagonist labor are at least as important as the fantastic element. The decidedly unromantic, even hardscrabble circumstances under which he must achieve his goals leaven the fantasy with a strong sense of reality, and highlight de Camp's unusual reversal of the genre's stereotypical rags to riches theme. The Unbeheaded King The Unbeheaded King is a fantasy novel by American writer L. Sprague de Camp, the fourth book of his Novarian series and the third in the "Reluctant King" trilogy featuring King Jorian of Xylar. It was first published as