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? seven nights in September 2011, running over the course of a week, except for the Tuesday night, from Saturday to the following Saturday. Over 100,000 people applied to compete in the show. In the penultimate round, "Duel", a video wall displayed a disc split into eight sections, numbered 1–8. Before the round started, an independent adjudicator randomised which sections were coloured red or black, with each colour having four sections; this choice was hidden to the contestants. A random player chose their colour, while the other player took the remaining colour. Each player then took it in turns to choose