Which of the following elements has an atomic number of 8?
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A.
Hydrogen
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B.
Nitrogen
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C.
Carbon
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D.
Oxygen
Correct Answer:
D. Oxygen
Explanation:
The correct answer is Oxygen. Oxygen is the chemical element identified by the symbol O and the atomic number 8, meaning its nucleus contains eight protons. In the periodic table, it is a highly reactive nonmetal and an oxidizing agent that readily forms oxides with most elements. On the other hand, Hydrogen has an atomic number of 1, Nitrogen has 7, and Carbon has 6. As the third-most abundant element in the universe by mass, oxygen is essential for the respiration of most living organisms on Earth and is a primary component of the Earth's atmosphere.
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