Open Question
Classify each element as a representative element, transition metal, or inner‑transition metal.
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which element in period 3 of the periodic table is classified as a metalloid?
A
Sodium (Na)
B
Magnesium (Mg)
C
Silicon (Si)
D
Phosphorus (P)
Verified step by step guidance1
Identify the elements in period 3 of the periodic table: Sodium (Na), Magnesium (Mg), Silicon (Si), Phosphorus (P), and others up to Argon (Ar).
Recall the classification of elements into metals, metalloids, and nonmetals based on their properties such as conductivity, luster, and chemical behavior.
Understand that metalloids have properties intermediate between metals and nonmetals, often found along the 'stair-step' line on the periodic table.
Locate Silicon (Si) in period 3 and recognize that it lies on the metalloid line, exhibiting both metallic and nonmetallic properties.
Conclude that among the given options, Silicon (Si) is the element classified as a metalloid in period 3.
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