They are called metalloids. They have properties of both metals and non metals.
elements
The terms "metal" and "nonmetal" are normally applied to elements, not compounds such as silver bromide.
element that is not metal
H2O is neither a metal nor a nonmetal. It is a compound consisting of two nonmetal elements, hydrogen and oxygen.
Carbon is a nonmetal. Thus this is a nonmetal oxide.
metal -->nonmetal --> gaseous (metal --> nonmetal --> metalloid)
Silver is a metal. It belongs to transition elements.
SO3 is a compound and therefore is neither a metal nor a nonmetal, because these are types of chemical elements, not of compounds. This particular compound consists of two nonmetal elements, sulfur and oxygen.
Elements that have some characteristics of a metal and some characteristics of a nonmetal are called semimetals or metalloids.
Cobalt is a metal. It belongs to d-block elements.
Iridium is a metal. It belongs to d-block elements.
iodine is a nonmental which falls in the group elements called HALOGENS;chlorine,fluorine,bromine and iodine.