Question

elements of group iii a and v a in the mendeleev's periodic table have the same general formula of their hydrides ( rh3 ) . how are they placed in different groups in Mendeleev's periodic table .
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Answer 1

Explanation:

Mendeleev divided his periodic table in eight groups and seven periods. Groups from I to VII are meant for normal elements and group VIII is for transition elements. Groups from I to VII have been divided in two sub groups, while group VIII is meant for three elements.

Answer 2

Answer:

They form different oxides, the general formula of oxides of III A is $R_{2} \mathrm{O}_{3}$ and that of group V A is $R_{2} O_{5}$. So, they are placed in the different groups in Mendeleev's periodic table.

Explanation:

As the elements present in group IIIA and VA in the Mendeleev Periodic Table form different oxides, that is why they are placed in different groups. The oxide of group IIIA is $R_{2}O_{3}$ and the oxide of group VA is $R_2O_5$.