Which characteristic describes elemental aluminium?

Elemental aluminium is well-known for its lightweight nature, making it an ideal choice for a wide range of applications, especially in industries such as aerospace and automotive, where reducing weight is crucial for efficiency. This lightweight property is due to aluminium's relatively low density compared to other metals.

In addition to being lightweight, aluminium is also highly corrosion resistant. This characteristic is primarily due to the formation of a thin oxide layer on its surface when it is exposed to air. This oxide layer acts as a protective barrier, helping to prevent further oxidation and corrosion, which enhances its durability and longevity in various environments.

Thus, the combination of being lightweight and exhibiting excellent corrosion resistance makes aluminium valuable for construction, packaging, and electrical sectors, among others.