Open Question
Which among the following elements does not exist as a diatomic molecule in nature?
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2. Atoms & Elements
Periodic Table: Elemental Forms
Multiple Choice
Which of the following is the most abundant gas by volume in Earth's atmosphere?
A
Ar (argon)
B
CO_2 (carbon dioxide)
C
O_2 (oxygen)
D
N_2 (nitrogen)
Verified step by step guidance1
Understand that Earth's atmosphere is composed of several gases, each present in different proportions by volume.
Recall the major components of dry air and their approximate volume percentages: Nitrogen (N_2) about 78%, Oxygen (O_2) about 21%, Argon (Ar) about 0.93%, and Carbon dioxide (CO_2) about 0.04%.
Compare the given options (Ar, CO_2, O_2) with nitrogen (N_2) in terms of their volume percentages in the atmosphere.
Recognize that nitrogen (N_2) has the highest volume percentage among these gases, making it the most abundant gas by volume in Earth's atmosphere.
Conclude that the correct answer is nitrogen (N_2) based on its dominant volume fraction compared to the other gases listed.
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