How does the nature of oxides vary in the third period?

Explanation

In `3^(rd)` period from left to right the oxide nature varies from high basic nature to high acidic nature.
`rarr` Basic nature gradually decreases and acidic nature gradually increases:
`rarr {:(Na_(2)O,MgO,Al_(2)O_(3),SiO_(2),P_(2)O_(5),SO_(3),Cl_(2)O),(("basic"),("basic"),("amphoteric"),("acidic"),("acidic"),("acidic"),"(acidic)"):}`