18. Consider the information about carbon provided in Model 4. a. Are diamonds and graphite made from the same element?
b. Can the existence of isotopes explain the difference in properties between diamond and
graphite? Explain.
C. Propose an explanation for the difference in properties between diamond and graphite.
19. O, and 0, (ozone) are allotropes of oxygen. Buckminsterfullerene (CG) is another allotrope
of carbon. Based on these statements and the information in Model 4, propose a definition for
allotrope.
20. Two common forms of phosphorus are red and white. Red phosphorus is fairly stable at room
temperature in air, but white phosphorus can ignite easily when exposed to air. Is this difference
in properties due to the existence of different isotopes of phosphorus or different allotropes?
Explain.