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

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

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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.
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User Agirardello
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