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? of "Red or Black?" consisted of 10 rounds; in each round, the player had to choose either red or black, with those who choose incorrectly being eliminated. The rounds are split into three stages. The first is an arena stage, which is recorded at Wembley Arena. The winning contestants move onto the location stage, where the numbers are eventually reduced down to the final eight. Those eight then go forward to the live studio final, where they are reduced down to the final competitor, who has a chance to play for the £1m prize. The first series was broadcast over