The most long-lived has a half-life of 8.3 hours, meaning that half of a sample of the element disappears in 8.3 hours. Because it is so rare and has such a short half-life, astatine is one of the most poorly understood of all chemical elements. It has no practical applications at ...
The name is derived from the Greek word βρώμος (bromos), meaning “bad smell” or “stench” [28]. The element bromine (as Br2) was first prepared by Balard in 1826. Bromine is concentrated in the upper mantle crust of the Earth and seawater, principally in the form of ...
The name Halogen is thought to derive from the Ancient Maori word “Halitosis” meaning dog-breath and refers to their overpowering odour which compares badly to that of unwashed Vietnamese peasants in a crowded, overheated sweatshop full of half-rotted vomit. Halogens themselves prefer to believe...