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2. An element's atomic number is equal to
A. the number of protons in its nucleus.
B. the number of neutons in its nucleus.
C. the number of protons and electrons in its nucleus.
D. the number of protons and neutrons in its nucleus.
Check Answer

A

Explanation:

an atom's atomic number is unique to it, and each element has a different number of protons in its nucleus. therefore, the answer is A.

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