What type of oxides is formed by metals?

Usually, metals produce basic oxides. such as calcium, potassium, and sodium. In other words, the salts have a pH that is higher than 7 on the pH scale. The negative logarithm of the concentration of hydronium ions is used to calculate pH. Metals dissolve into oxides, releasing oxide ions that in turn produce hydroxide (basic) ions. However, a small number of metals can produce amphoteric oxides, which can be both acidic and basic. like zinc and lead.