Multiple Choice
How did Henry Moseley change the periodic table in 1913 to its modern form?
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2. Atoms & Elements
Periodic Table: Classifications
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Which of the following elements is classified as a metalloid in the periodic table?
A
Na
B
O
C
Si
D
Fe
Verified step by step guidance1
Understand the classification of elements in 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, and is classified as a metal.
Recognize that Oxygen (O) is a nonmetal, located in Group 16, and is a typical nonmetal element.
Identify Silicon (Si) as an element located along the 'stair-step' line that separates metals and nonmetals in the periodic table, which is characteristic of metalloids.
Note that Iron (Fe) is a transition metal, located in the d-block, and is classified as a metal.
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