Fewpal
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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 K2O.

C is in group 4. Therefore, the oxide will be CO2.

Al is in group 3. Therefore, the oxide will be Al2O3.

Si is in group 4. Therefore, the oxide will be SiO2.

Ba is in group 2. Therefore, the oxide will be BaO.

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