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Fe2O3 - wart. metalu (Fe) III; wart. niemietalu (O): II
N2O5 - wart. niemetalu (N) V; wart. niemetalu (O): II
CO2 - wart. niemetalu (C) IV; wart. niemetalu (O): II
H2SO4 - wart. niemetalu (S) VI; wart. niemietalu (O): II; wart. niemetalu (H): II
H3PO4 - wart. niemetalu (P) V; wart. niemetalu (O): II; wart. niemetalu (H): III