Multiple Choice
In the periodic table, a horizontal row is called a(n):
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4. Atoms and Elements
Periodic Table: Classifications
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Which element makes up most of Earth’s atmosphere (by volume)?
A
Nitrogen (N)
B
Oxygen (O)
C
Argon (Ar)
D
Carbon (C)
Verified step by step guidance1
Understand that Earth's atmosphere is composed of several gases, each contributing a certain percentage by volume.
Recall that the major components of the atmosphere include Nitrogen (N\_2), Oxygen (O\_2), Argon (Ar), and trace amounts of other gases like Carbon dioxide (CO\_2).
Identify that Nitrogen (N\_2) is the most abundant gas in the atmosphere, making up about 78% by volume.
Recognize that Oxygen (O\_2) is the second most abundant, approximately 21%, followed by Argon (Ar) at about 0.93%.
Conclude that since Nitrogen has the highest volume percentage, it is the element that makes up most of Earth's atmosphere.
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