an element o period 3 and group 6
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here
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acid , bases and salt
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Group 6A — The Chalcogens. Group 6A (or VIA) of the periodic table are the chalcogens: the nonmetals oxygen (O), sulfur (S), and selenium (Se), the metalloid tellurium (Te), and the metal polonium (Po). ... The Group 6A elements have six valence electrons in their highest-energy orbitals (ns2np4).
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