# An element R forms the highest oxide $R_{2}O_{5}$ . R belong to Option 1) 4 group Option 2) 6 group Option 3) 5 group Option 4) 8th group

As we learned in concept

Aufbau Principle -

In the ground state of the atoms, the orbitals are filled in order of their increasing energies.

- wherein

R2O5 , the oxidation state of R is +5 which means it must belong to the fifth group.

Option 1)

4 group

This option is incorrect.

Option 2)

6 group

This option is incorrect.

Option 3)

5 group

This option is correct.

Option 4)

8th group

This option is incorrect.

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