Multiple Choice
Which of the following elements can be found in the second period of the periodic table?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following elements make up most of Earth's crust?
A
Sodium and chlorine
B
Oxygen and silicon
C
Carbon and hydrogen
D
Iron and nickel
Verified step by step guidance1
Understand that Earth's crust is the outermost solid layer of the Earth, composed mainly of various elements combined into minerals.
Recall that the most abundant elements in the Earth's crust are those that form the majority of common rock-forming minerals.
Identify that oxygen is the most abundant element in the Earth's crust because it forms oxides and silicates, which are very common minerals.
Recognize that silicon is the second most abundant element, primarily because it combines with oxygen to form silicate minerals, which dominate the crust.
Conclude that among the given options, oxygen and silicon are the elements that make up most of Earth's crust.
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