Unformatted text preview: a Extension Questions Model 4 Allotropes of Carbon Natural Sample Properties T Structure Composition l i Black 1 98. 89 Carbon 1 2 Soft 1. 11 Carbon13 Conductive Graphite Colorless 1 98. 89 Carbon12 Very hard 1. 1 1 Carbon13 lnsulzttor Diamond 18. Consider the inlbtnmtion about carbon provided in Model 4.