Write isotope symbols for atoms with the following characteristics. a) Contains 18 electrons and 20 neutrons; b) A calcium atom with a mass number of 40; c) An arsenic atom that contains 42 neutrons

Introductory Chemistry For Today
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Chapter2: Atoms And Molecules
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Problem 2.21E
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Write isotope symbols for atoms with the following characteristics. a) Contains 18 electrons and 20 neutrons; b) A calcium atom with a mass number of 40; c) An arsenic atom that contains 42 neutrons

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