They are not suitable for electrical wiring because they are poor conductors of heat and electricity and they are neither malleable nor ductile.
The physical properties of different metals make them useful for different purposes. For example, copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points. The free electrons in metals can move through the metal, allowing metals to conduct electricity.
Nonmetals as their name implies, are elements that display properties quite different from those of metals. Included in this broad grouping are the six noble gases, the five halogens, and eight "orphan" elements.
Nonmetal elements are omnipresent and essential for life. Learn more about the properties and typical reactions of these important elements.