What are d-Block elements ? Write their general electronic configuration.

Explanation

Zeolites are micro-porous alumino silicates with general formula:
`M_(x//m) [(AlO_2)_x (SiO_2)_3]m H_2O`
Where n = valency of cation x = number of `AlO_2` molecules
y = number of `SiO_2` molecules m = number of water molecules
These are also known as shape selective catalysts.