Multiple Choice
Which element has a total of two occupied principal energy levels?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which are the two most abundant elements in Earth's continental crust?
A
Oxygen and silicon
B
Iron and aluminum
C
Calcium and magnesium
D
Sodium and potassium
Verified step by step guidance1
Understand that the Earth's continental crust is primarily composed of various elements, with some being more abundant than others.
Recall that oxygen is the most abundant element in the Earth's crust because it forms many compounds, especially oxides and silicates.
Recognize that silicon is the second most abundant element, as it combines with oxygen to form silicate minerals, which dominate the crust.
Note that other elements like iron, aluminum, calcium, magnesium, sodium, and potassium are present but in smaller amounts compared to oxygen and silicon.
Conclude that the two most abundant elements in the Earth's continental crust are oxygen and silicon.
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