Definition
Allotropism is essentially the same as allotropy. It's the ability of an element to exist in different forms (allotropes) in the same physical state. These different forms have distinct properties due to variations in their atomic arrangement or bonding. Oxygen existing as Oβ or Oβ (ozone) is a classic example. Think of it as PokΓ©mon evolving into different forms; same basic creature, different powers and appearance.