6.2 Properties of Transition Elements

The transition elements are located in the central block of the periodic table and are known for their unique and useful properties. Unlike the elements across Period 3, which show a gradual change from metals to non-metals, the transition elements are all metals and share many similar characteristics. This section explores their physical and chemical properties, which make them vital for modern industry and technology.

Main Idea

The main idea is that the transition elements are much more similar to each other than the elements across a period. For instance, they are all metals rather than showing a change from metal to metalloids and non-metals. On the other hand, when we move along Period 3, there come metals, then metalloids, non-metals, and then noble gases. Similarly, there is not that decrease in atomic radii as in Period 3 elements. Due to such similarities, transition metals show a set of characteristic physical and chemical properties.

Core Concept

The core concept is that the properties of transition metals arise from their incomplete d subshells and their ability to form metallic bonds involving both s and d electrons. This gives them high melting points, high density, and the ability to form alloys. Chemically, their variable oxidation states and vacant d orbitals allow them to act as catalysts and form colored complexes.