Metals are associated with being shiny and good conductors of electricity. They are typically not dull, brittle, or poor conductors of electricity.
Dullness is a physical property.
Helium is neither shiny nor dull; it is translucent (transparent; colorless). Helium is a colorless gas
Nonmetals are often dull, brittle, and poor conductors of heat and electricity. Unlike metals, which are typically shiny and malleable, nonmetals tend to have a dull appearance and can break easily when subjected to stress. Common examples of nonmetals include sulfur, phosphorus, and carbon in certain forms.
Metals are typically shiny, dense, and good conductors of heat and electricity. Nonmetals are generally dull in appearance, brittle, and poor conductors. Metalloids have properties that fall between metals and nonmetals, such as being semiconductors and having intermediate conductivity.
Elements that are brittle and dull are likely to be nonmetals. Nonmetals tend to have brittle, dull properties compared to metals which are typically malleable and lustrous. Examples of brittle and dull elements include carbon in the form of graphite and sulfur.
a nonmetal because a metal is shiny and strong so a nonmetal is brittle and dull
Brittle materials can exhibit both shiny and dull appearances. Whether a brittle material looks shiny or dull depends on its composition and surface characteristics. Some brittle materials might have a shiny appearance due to a smooth surface finish, while others may appear dull if they have a rough or textured surface.
semiconductors
a nonmetal because a metal is shiny and strong so a nonmetal is brittle and dull
Non-metals are dull (or they are not shiny as metals).
poor dry skin, dull brittle hair, brittle nails, pale
Metals are associated with being shiny and good conductors of electricity. They are typically not dull, brittle, or poor conductors of electricity.
Dullness is a physical property.
Semiconductors are typically dull in appearance. They are made of materials like silicon or germanium, which do not have a reflective surface like metals but rather have a matte finish.
The element that fits this description is sulfur. Sulfur is a non-metal that is brittle, meaning it breaks easily when subjected to stress. It has a dull appearance and does not conduct electricity because it lacks free electrons to carry an electric current.
Coal typically has a dull or matte luster, meaning it does not shine like metals or some minerals. It can appear dull, black, and brittle in texture.