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? slightly more viewers, with 4m tuning in. On the return of "Red or Black?" to Saturday night, the show climbed above 4 million for the first time in three days, to 4.63m for the first show and then up to 5.67m for the second. This enabled ITV to beat BBC One in the primetime ratings overall, by 23.3% to 21%, even though the first episode of series 8 of "Strictly Come Dancing" was broadcast on BBC. However "Red or Black?" individually placed behind both "Strictly" and "Doctor Who", with the overnights for the BBC shows being 7.6 and 6.0 million,