Final answer:
Nonmetals are poor conductors of heat and electricity, and they can exist in different states of matter. They are typically brittle and not shiny or lustrous like metals.
Step-by-step explanation:
Nonmetals are generally poor conductors of heat and electricity. They can exist in all three states of matter: gases, liquids, and solids. Nonmetals tend to be brittle when in solid form and are not shiny or lustrous like metals.