In any period, the valency of an element with respect to oxygen

Options

A. charges randomly
B. increases one by one from `IA`to `VIIA`
C. decreases one by one from `IA`toVIIA`
D. `increases one by one from `IA`to `IVA` and then decreases from `VA` to `VIIA` one by one

Answer

B

Explanation

Oxygen is the `2nd` most electronagative elemnt, thus, it bringes out the maximum oxidation number of the element as reflected by the formulas of oxides:
`|{:("Group",I,II,III,IV,V,VI,VII),("Formula",E_(2)O,EO,E_(2)O_(3),EO_(2),E_(2)O_(5),EO_(3),E_(2)O_(7)),("Valanvy",1,2,3,4,5,6,7):}:|`
where `E` is the element.