Medium
Use Mendeleev's Periodic Table to predict the formulae for the oxides of the following elements: $K, C, Al, Si, Ba$.
- A$K_2O, CO_2, Al_2O_3, SiO_2, BaO$
- B$K_2O, CO, Al_2O_3, SiO, BaO_2$
- C$KO, CO_2, AlO_3, Si_2O_4, Ba_2O$
- D$K_2O_2, C_2O, Al_3O_2, SiO_2, BaO_2$
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