A certain element has 45 protons and an atomic mass of 64. What is its atomic number?

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✓ Correct answer: B. 45 The atomic number of an element is equal to the number of protons in its nucleus. Given that the element has 45 protons, its atomic number is 45.

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A certain element has 45 protons and an atomic mass of 64. What is its atomic number?

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