Multiple Choice
Which of the following is magnesium classified as on the periodic table?
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2. Atoms & Elements
Periodic Table: Classifications
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Which of the following is classified as an element?
A
Carbon dioxide (CO_2)
B
Oxygen (O)
C
Sodium chloride (NaCl)
D
Water (H_2O)
Verified step by step guidance1
Understand the definition of an element: An element is a pure substance consisting of only one type of atom, represented by a unique chemical symbol on the periodic table.
Analyze each option to determine if it contains only one type of atom or multiple types: For example, carbon dioxide (CO_2) contains carbon and oxygen atoms, so it is a compound, not an element.
Check oxygen (O): It is represented by a single chemical symbol and consists of only oxygen atoms, so it qualifies as an element.
Review sodium chloride (NaCl): It contains sodium and chlorine atoms, making it a compound rather than an element.
Examine water (H_2O): It contains hydrogen and oxygen atoms, so it is also a compound, not an element.
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