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Use Mendeleev's Periodic Table to predic...

Use Mendeleev's Periodic Table to predict the formulae for the oxides of the following elements: K, C, Al, Si, Ba.

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K is in group 1, Therefore the oxide will be `K_2O`.
C is an group 4, Therefore the oxide will be `CO_2`.
Si is in group 4, Therefore the oxide will be `SiO_2`.
Al is in group 3, Therefore the oxide will be `AI_2 O_3`.
Ba is in group 2, Therefore the oxide will be `BaO`.
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