The d-block elements are transition metals. They still exhibit the properties expected of metals just like the main group elements even though they are not as reactive as the main group metals.
The periodic table is divided into blocks; s- block, p- block, d - block and f - block.
The s - block and p - block elements are called the main group elements. The elements of the d - block has some unique properties due to the presence of partially filled d - orbitals.
However, the d - block elements are metals and also undergo many of the reactions expected of metals. They still displace hydrogen from dilute acid and react with water(just a few of them) under appropriate conditions to liberate hydrogen gas etc.
However, the first row transition elements are more reactive than the second and third row which tends to be more noble.
Generally, the d - block elements are far less reactive than s - block and p - block metals.
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