Textbook Question
Group 1A and 2A elements are sometimes called, collectively, “the s-block.” Therefore, what is an analogous name for the entire collection of the group 3A, 4A, 5A, 6A, 7A, and 8A elements?
2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which two elements are the most abundant in the Earth's crust?
A
Oxygen and silicon
B
Iron and aluminum
C
Hydrogen and carbon
D
Calcium and sodium
Verified step by step guidance1
Understand that the Earth's crust is composed of various elements, but some are much 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, primarily because it combines with oxygen to form silicate minerals, which make up a large portion of the crust.
Compare the given options by considering the common elements found in the crust: oxygen and silicon are known to be the top two, while iron, aluminum, calcium, sodium, hydrogen, and carbon are present but in smaller amounts.
Conclude that the two most abundant elements in the Earth's crust are oxygen and silicon based on their prevalence in crustal minerals.
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