An element's atomic number is determined by the number of ________ in one atom of that element.
A) protons
B) nuclei
C) electrons
D) neutrons
E) atomic mass units

Name: An element's atomic number is determined by the number of ________ in one atom of that element. A) protons B) nuclei C) electrons D) neutrons E) atomic mass units
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The atomic number of an element is defined by the number of protons in the nucleus of an atom of that element.

An Element's Atomic Number Is Determined by the Number of ________