Multiple Choice
What is the primary purpose of the periodic table in chemistry?
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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 on the periodic table?
A
Sodium (Na)
B
Neon (Ne)
C
Silicon (Si)
D
Chlorine (Cl)
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Understand the classification of elements on the periodic table: metals, nonmetals, and metalloids. Metalloids have properties intermediate between metals and nonmetals.
Recall that Sodium (Na) is an alkali metal, located in Group 1 of the periodic table, so it is classified as a metal.
Neon (Ne) is a noble gas, found in Group 18, and is classified as a nonmetal.
Silicon (Si) is located along the stair-step line (also called the metalloid line) on the periodic table, which separates metals and nonmetals. Elements along this line are metalloids.
Chlorine (Cl) is a halogen, found in Group 17, and is classified as a nonmetal.
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