Multiple Choice
Which element in period 3 of the periodic table is known to be a highly reactive metal?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
Multiple Choice
Which three elements make up most of Earth's atmosphere?
A
Oxygen, carbon dioxide, nitrogen
B
Oxygen, argon, carbon dioxide
C
Nitrogen, oxygen, argon
D
Nitrogen, hydrogen, oxygen
Verified step by step guidance1
Recall that Earth's atmosphere is primarily composed of gases, with three main elements making up the majority of its volume.
Identify the most abundant gases in the atmosphere: nitrogen (N\_2), oxygen (O\_2), and argon (Ar). These are elements or elemental forms present in large amounts.
Understand that carbon dioxide (CO\_2) and hydrogen (H\_2) are present but in much smaller quantities compared to nitrogen, oxygen, and argon.
Recognize that nitrogen makes up about 78%, oxygen about 21%, and argon about 0.93% of the atmosphere by volume, which together constitute the vast majority of atmospheric gases.
Conclude that the three elements making up most of Earth's atmosphere are nitrogen, oxygen, and argon.
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