(1) The difference in the arrangement of space in the atoms that make up the structure of an element is called allotropy .

(2) The best known example for allotropy is iron.

(3) An example of allotropy is carbon, which can exist as diamond, graphite, and amorphous carbon.

(4) With the exception of nitrogen, all group V elements show allotropy .

(5) Sulfur exists in three allotropic forms, two of which are yellow crystalline solids, and the third of which is an amorphous thick, brown, plastic liquid.

(6) As its two allotropic forms might suggest, silicon is a metalloid.

(7) Synthetic diamonds are produced by forcing an allotropic transition from graphite to diamond under conditions of extremely high temperature and mechanical pressure over a period of several days or weeks.

(8) Graphite is one of the four allotropic forms of carbon; the other three are amorphous carbon, diamond, and fullerene.

(9) Manganese exists in four allotropic forms, the most common of which is stable to a temperature of about 1,300u00b0F.