Multiple Choice
Which element has protons in its nucleus?
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4. Atoms and Elements
Periodic Table: Classifications
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Which element is the most abundant in the Earth's crust by mass?
A
Silicon (Si)
B
Aluminum (Al)
C
Oxygen (O)
D
Iron (Fe)
Verified step by step guidance1
Understand that the Earth's crust is composed of various elements, each present in different proportions by mass.
Recall that the most abundant element in the Earth's crust is determined by its percentage composition by mass, not by the number of atoms.
Recognize that oxygen is the most abundant element in the Earth's crust because it forms many compounds with other elements, especially silicates.
Note that silicon, aluminum, and iron are also abundant but are present in smaller mass percentages compared to oxygen.
Conclude that oxygen (O) is the most abundant element in the Earth's crust by mass due to its high percentage in the composition of minerals and rocks.
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