What elements fall under metals nonmetals and metalloids?

Metals, nonmetals, and metalloids are categorized based on their physical and chemical properties. Metals, such as iron, copper, and aluminum, are typically shiny, conductive, and malleable. Nonmetals, including oxygen, carbon, and sulfur, are usually dull, poor conductors, and brittle in solid form. Metalloids, like silicon and arsenic, exhibit properties intermediate between metals and nonmetals, making them useful in various applications, particularly in electronics.