The transition metals have a typical metallic structure which explains most of their properties. The metal's atoms exist in a giant structure held together by metallic bonds, the outer electrons can move freely.
Good conductors of heat and electricity because delocalised electrons carry the electrical current or the heat energy through the metal.
They are also hard, tough and strong, yet we can bend or hammer them into useful shapes.
With the exception of mercury, the transition metals have high melting points.
Transition metals have a partly-filled lower energy level which explains why transition metals form brightly coloured compound. It also results in their use as catalysts.
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