Multiple Choice
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
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Which of the following elements is not classified as a metal?
A
Na
B
Al
C
O
D
Fe
Verified step by step guidance1
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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