객관식
Which scientist was the first to arrange the elements in order of increasing atomic number on the periodic table?
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2. Atoms & Elements
Periodic Table: Classifications
객관식
Which of the following elements is not classified as a metal?
A
Na
B
Al
C
O
D
Fe
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검증된 단계별 안내1
Recall the classification of elements into metals, nonmetals, and metalloids based on their properties and position in the periodic table.
Identify the elements given: Na (Sodium), Al (Aluminum), Fe (Iron), and O (Oxygen).
Check the periodic table groups: Na, Al, and Fe are located on the left and center of the periodic table, which are typically metals.
Recognize that Oxygen (O) is located on the right side of the periodic table and is a nonmetal.
Conclude that Oxygen (O) is the element that is not classified as a metal among the options provided.
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