Find the mendeleev's periodic table group number of the following elements from their hydrides and oxides formula.

Q:

Element

Oxide formula

Hydride formula

Group number

A

A2O3

AH3

 

B

A2O7

AH

 

C

A2O5

AH3

 

Answer:

Element

Oxide formula

Hydride formula

Group number

A

A2O3

AH3

3

B

A2O7

AH

7

C

A2O5

AH3

5

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