1) What is Au? a) gold b) silver c) iron 2) What is copper? a) Ge b) Cn c) Cu 3) What is oxygen's atomic number? a) 25 b) 6 c) 8 4) What group is sulfur in? a) noble gases b) non metals 5) How many elements are in the periodic table? a) 127 b) 139 c) 123 d) 111 e) 128 f) 193

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