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Which of the following does NOT accurately describe the forces that exist within an atom?
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2. Atoms & Elements
The Atom
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Which one of the following is the most abundant gas in Earth's atmosphere?
A
Ar (argon)
B
N_2 (nitrogen)
C
O_2 (oxygen)
D
CO_2 (carbon dioxide)
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Understand that Earth's atmosphere is composed of several gases, each present in different proportions.
Recall that the most abundant gas is the one with the highest volume or mole fraction in the atmosphere.
Recognize that nitrogen (N_2) makes up about 78% of the atmosphere by volume, which is more than oxygen (O_2), argon (Ar), and carbon dioxide (CO_2).
Argon is a noble gas present in smaller amounts (about 0.93%), oxygen is about 21%, and carbon dioxide is less than 0.05% under normal conditions.
Therefore, by comparing these percentages, conclude that nitrogen (N_2) is the most abundant gas in Earth's atmosphere.
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