41. The amorphous allotrope is a brown powder. 42. Examples of solid elemental insulators are diamond ( an allotrope of carbon ) and sulfur. 43. :Diamond is an allotrope of carbon. 44. Although oxygen is normally a diatomic gas, oxygen can form an allotrope known as ozone. 45. In addition, the element sulfur forms octatomic S 8 molecules as its most stable allotrope . 46. Allotropes are different chemical forms of the same element ( not containing any other element ).47. A real question might be whether Co 3 is a naturally-occurring allotrope of cobalt. 48. It is certainly not an allotrope . 49. Early workers identified some forms that have later proved to be single or mixtures of allotropes . 50. At least five allotropes are uniquely formed at high pressures, two of which are metallic.
