Which of the following elements has an atomic number of 8?
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A.
Oxygen
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B.
Nitrogen
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C.
Carbon
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D.
Hydrogen
Correct Answer:
A. Oxygen
Explanation:
Oxygen is the element with an atomic number of 8, meaning its atoms contain exactly eight protons in their nuclei. While nitrogen has an atomic number of 7, carbon has 6, and hydrogen has 1, oxygen is uniquely identified by this specific proton count. This characteristic places oxygen in the second period of the periodic table, where it serves as a highly reactive nonmetal and a vital component for life and combustion on Earth.
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