Question

Use Mendeléev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, AI, Si, Ba.

Answer 1

K is in group 1. Therefore, the oxide wll be `K_(2)O`
C is the group 4. Therefore, the oxide will be `CO_(2)`.
Al is in group 4. Therefore, the oxide will be `Al_(2)O_(3)`
Si is in group 4. Therefore, the oxide will be `SiO_(2)`
Ba is in group 2. Therefore, the oxide will be BaO.