Question

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Answer 1

Answer:

The element sodium belongs to group I of Mendeleev's periodic table in which the general formula of oxides of elements is R2O. So formula of oxide of Sodium is Na2O. --> Rb element also belongs to Group I so formula of oxide is Rb2O.

Answer 2

oxide of group 1 alkali metal

Li2O

Na2O2

kO2

RbO2

CsO2

FrO2