Final answer:
Nonmetals are elements with properties opposite to metals, including being poor conductors and typically dull. They can form various types of compounds by reacting with other elements. Chlorine, bromine, and carbon are examples of nonmetals.
Explanation:
Nonmetals are elements that are typically dull, brittle as solids, and poor conductors of heat and electricity. They are located in the top-right corner of the periodic table, and most are gases, with a few solids and one liquid.
Physically, nonmetals exhibit properties opposite to metals, and chemically, they tend to have high electronegativity values, gaining or sharing electrons in reactions. They can form molecular compounds by reacting with each other or ionic compounds by accepting electrons from metals.
Elements like chlorine, bromine, and carbon represent nonmetals and are crucial in understanding the periodic table and chemical properties of elements.
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