Allotropes of phosphorus Allotropes of phosphorus Elemental phosphorus can exist in several allotropes, the most common of which are white and red solids. Solid violet and black allotropes are also known. Gaseous phosphorus exists as diphosphorus and atomic phosphorus. White phosphorus, yellow phosphorus or simply tetraphosphorus (P) exists as molecules made up of four atoms in a tetrahedral structure. The tetrahedral arrangement results in ring strain and instability. The molecule is described as consisting of six single P–P bonds. Two different crystalline forms are known. The α form is defined as the standard state of the element, but is actually metastable under standard
Red or Black? such as Battersea Power Station and the set of "Coronation Street". "Red or Black?" was commissioned for a second series, which featured the format having been revamped significantly. While the first series featured six pre-recorded rounds in several different locations and four live rounds, the second series featured six pre-recorded rounds that take place in either the "Red or Black?" Arena or in the studio. Celebrities such as Carol Vorderman, Jonathan Ross and Little Mix were involved in the rounds for this series. The show is a joint production between Syco TV and ITV Studios, and was initially broadcast on