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What is the atomic number and the mass number of an atom with 17 protons and 18 neutrons?
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What is the atomic number and the mass number of an atom with 17 protons and 18 neutrons?

User Shalanda
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The atom with 17 protons and 18 neutrons is chlorine. Its atomic number is 17 and its mass number is 35.453 u

User Udo Klein
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