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HESI A2 – Chemistry questions and answers 100% verified.
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HESI A2 – Chemistry questions and answers 100% verified. An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number? A) It cannot be determined B) 19 C) 45 D) 56 - correct answers.C) 45 (The number of protons in an atom...
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