An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?

The atomic number tells you how many protons an atom has. Zinc’s atomic number is 30, so an uncharged zinc atom has 30 protons. The mass number, 65, is the total number of protons and neutrons, not the number of protons alone.

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