Question

What is the general formula of oxides and hydrides of third group element according to mendeleev?

Answer 1

nhi ) 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)The element Silicon belongs to Group IV of Mendeleev's periodic table in which the general formula is RO2.

So, the formula for oxide of Si is SiO2.

Sn belongs same group so formula of its oxide is SnO2.

C belongs to same group so formula of oxide is CO2.

3) Ca belongs to group II of Mendeleev's periodic table. The general formula of Oxide is RO.

So formula for Oxide of Ca is CaO.

Ba belongs to this group, so formula of oxide is BaO.

4) Phosphorous belongs to group V. so general formula of oxide is R2O5.

So formula of oxide is P2O5.

5)Cl belongs to group VII with general formula R2O7.

So formula of their oxide is Cl2O7

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Answer 2

Explanation:

for third group general formula is

oxides R2O3

hydrides RH3