K is in group 1. Therefore, the oxide will be \\( \\mathrm{K_{2}O} \\).
C is in group 4. Therefore, the oxide will be \\( \\mathrm{CO_{2}} \\).
A1 is in group 3. Therefore, the oxide will be \\( \\mathrm{AL_{2}O_{3}} \\).
Si is in group 4. Therefore, the oxide will be \\( \\mathrm{SiO_{2}} \\).
Ba is in group 2. Therefore, the oxide will be \\( \\mathrm{BaO} \\).