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Otocz kółkiem symbole pierwiastków chemicznych Na, H2O, KI, O, S, CO, MgO, Co, Si, Al, Fe2O3
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Otocz kółkiem symbole pierwiastków chemicznych

Na, H2O, KI, O, S, CO, MgO, Co, Si, Al, Fe2O3

User Derek McCrae Norton
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This particular question is asking for the turker to circle the symbols of the chemical elements. The listed elements to be circled include the various choices: NA, S, O, Co, Si, and Al. The rest of the symbols are not chemical elements.
User Agirardello
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