Examine Figure 2.3, The periodic table. (f) Classify the following three elements as metals, nonmet-als, or semimetals: Mo, Br, Si.

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Identify the position of each element on the periodic table.

Determine the general classification of elements based on their position: metals are typically on the left and center, nonmetals are on the right, and semimetals (metalloids) are along the zigzag line.

Classify Molybdenum (Mo): It is located in the transition metals section, which is in the center of the periodic table.

Classify Bromine (Br): It is located on the right side of the periodic table, where nonmetals are typically found.

Classify Silicon (Si): It is located along the zigzag line, which is where semimetals (metalloids) are typically found.

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Periodic Table Classification

The periodic table organizes elements based on their atomic number and properties. Elements are classified into three main categories: metals, nonmetals, and semimetals (or metalloids). Metals, typically found on the left side and center of the table, are good conductors of heat and electricity. Nonmetals, located on the right side, have varied properties and are generally poor conductors. Semimetals exhibit characteristics of both metals and nonmetals.

Properties of Metals

Metals are characterized by their luster, malleability, ductility, and good electrical and thermal conductivity. They tend to lose electrons during chemical reactions, forming positive ions. Common examples include elements like iron (Fe) and copper (Cu). In the context of the question, molybdenum (Mo) is classified as a metal due to these properties.

Properties of Nonmetals and Semimetals

Nonmetals are generally poor conductors of heat and electricity and can gain or share electrons in chemical reactions, forming negative ions or covalent bonds. Bromine (Br) is a nonmetal, known for its reactivity and existence as a liquid at room temperature. Semimetals, like silicon (Si), have intermediate properties; they can conduct electricity better than nonmetals but not as well as metals, making them essential in electronics.