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In the periodic table, what are the horizontal rows called?
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4. Atoms and Elements
Periodic Table: Classifications
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Which of the following elements is classified as a metalloid?
A
Chlorine (Cl)
B
Silicon (Si)
C
Neon (Ne)
D
Sodium (Na)
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Understand the classification of elements into metals, nonmetals, and metalloids based on their physical and chemical properties.
Recall that metalloids have properties intermediate between metals and nonmetals and are typically found along the 'stair-step' line on the periodic table.
Identify the elements given: Chlorine (Cl) is a nonmetal, Neon (Ne) is a noble gas (nonmetal), Sodium (Na) is a metal, and Silicon (Si) is a metalloid.
Locate Silicon (Si) on the periodic table, which is positioned along the metalloid line, confirming its classification as a metalloid.
Conclude that among the options, Silicon (Si) is the element classified as a metalloid.
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