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Who is credited with creating the first widely recognized periodic table of elements?
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2. Atoms & Elements
Periodic Table: Classifications
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Which of the following elements is classified as a metalloid?
A
Na (Sodium)
B
Si (Silicon)
C
Fe (Iron)
D
O (Oxygen)
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Understand the classification of elements: Metals, nonmetals, and metalloids. Metalloids have properties intermediate between metals and nonmetals.
Recall that Sodium (Na) is an alkali metal, so it is classified as a metal.
Recognize that Iron (Fe) is a transition metal, so it is also classified as a metal.
Know that Oxygen (O) is a nonmetal, a typical example of a nonmetallic element.
Identify Silicon (Si) as a metalloid because it exhibits properties of both metals and nonmetals, such as semiconducting behavior.
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