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Answer 1

Answer:

1) 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

2)Such as if Aluminium combines with Chlorine then the formula of aluminium chloride is AlCl3. The group 13 elements are the first group in the p-block of the periodic table. All the elements of group 13 are also called the boron family. The periodic table is segregated into s, p, d and f-blocks.

3)The compound formed is usually is called Halide. Its chemical formula will be AB2. Explanation: Since the valency of elements in group 2 is +2 and -1 of elements in group 17, when these two elements react, A will accept 2 ions of B or each B atom will donate 1 ion to A resulting in formation of compound AB2

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Answer 2

Answer:

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