Practice!

Sample Problem

Which of the following are examples of allotropes?

(A) CO, CO2, CO3

(B) V2+, V3+, V4+

(C) Graphite, diamond, fullerene

(D) Red phosphorus, white phosphorus

(E) Ice, water, steam

Solution

Allotropism is a property of chemical elements that describe the ability to exist in two or more forms due to differences in bonding between atoms, resulting in having different properties. Only options C and D describe this behavior (differences in carbon-carbon and phosphorus-phosphorus bonding respectively).