The atomic number is 9. The atomic number of an element is the number of protons in one atom of that element. Thus, if an atom of an element has nine protons, then its atomic number is also nine. The atomic number is also called the proton number of the element. Since this atom has 9 protons, then its atomic number will be 9.
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Answer:
B
Explanation:
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The answer is:
B. 9
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The atomic number is 9. The atomic number of an element is the number of protons in one atom of that element. Thus, if an atom of an element has nine protons, then its atomic number is also nine. The atomic number is also called the proton number of the element. Since this atom has 9 protons, then its atomic number will be 9.
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Explanation:
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