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1.Ktoré z nasledovných druhov zlúčenín tvoria najčastejšie hlavnú zložku rudy: kremičitany, hydroxidy, sulfidy, peroxidy, oxidy, hydridy?
2.Určte, do ktorej periódy a ktorej skupiny periodickej sústavy je zaradený neprechodný prvok, ak majú jeho atómy takéto usporiadanie valenčných elektrónov: a) 2s²2p², b) 3s² 3p³, c) 1s¹, d) 7s², e) 4s²4pª.
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