Answer Explanation 1 Identify the Chalcogen in period 3. Chalcogens are elements in group 16 of the periodic table. The Chalcogen in period 3 is Sulfur (S) 2 Determine the atomic mass number of Sulfur. The atomic mass number is the sum of protons and neutrons in an atom’s nucleus. Sulfur has 16 protons and 16 neutrons
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