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...Classification of elements there are about known at present it is difficult to study and describe all the properties these separately thus grouped together on basis similarity they placed in a periodic table this called classified into metals non metalloids those which hard lustrous malleable ductile as can loose electrons electropositive nature brittle accept electronegative metalloid chemical element that exhibits some nonmetals with intermediate between boron silicon germanium arsenic antimony tellurium polonium metal good conductor both electricity heat forms cations ionic bonds from greek metallon minerals characterized by high electrical conductivity atoms readily lose form positive ions surrounded delocalized responsible for examples iron copper zinc magnesium sodium potassium gold silver platinum etc...