Period 6 element period 6 other metals are incredibly toxic, such as thallium. Period 6 contains the last stable element, lead. All subsequent elements in the periodic table are radioactive. After bismuth, which has a half-life or more than 10 years, polonium, astatine, and radon are some of the shortest-lived and rarest elements known; less than a gram of astatine is estimated to exist on earth at any given time. Caesium or cesium is the chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes
Pokémon episodes removed from rotation name, and/or weapons in the episode. The first episode to be removed from rotation after the September 11 attacks of 2001, mainly because the censors noted similarities between the attacks and Tentacruel attacking the city. The character Nastina also used military-style weapons during the fight scenes in the episode. However, Tentacruel striking a building was not removed from the dub's opening theme, and the episode is still readily available on the home video and DVD markets. The episode was aired a month after the September 11 attacks, and was not aired in the US again until the series began airing