iron(II) oxide is FeO and has two ions Fe2+ and O2-
Potassium oxide, with the chemical formula K2O, consists of two potassium ions (K+) and one oxide ion (O2-). Therefore, there are a total of 3 ions in potassium oxide.
Oxide ions are anions. Anions are negatively charged ions that have gained electrons, while cations are positively charged ions that have lost electrons. Oxide ions have a charge of -2.
0.34 moles Na2O (1 mole O 2-/1 mole Na2O)(6.022 X 1023/1 mole O 2-) 2.1 X 1023 ions of oxygen ================
The formula for aluminum oxide is Al2O3, which means that, if aluminum oxide is ionically bonded, every formula mass of aluminum oxide contains three O-2 ions. In this instance, 0.65 formula masses of aluminum oxide would contain 3 X 0.65 or 1.95 moles of O2-. If aluminum oxide were covalently bonded, it would not contain any O-2 ions.
Calcium oxide is a single ionic substance made of two different ions. Calcium oxide (Ca2+) and oxide ions (O2-). But the two different ions are generally not considered substances in and of themselves.
When potassium reacts with oxygen, it forms potassium oxide (K2O). In potassium oxide, the ratio of potassium ions (K⁺) to oxide ions (O²⁻) is 2:1. This is because each potassium ion has a +1 charge, while each oxide ion has a -2 charge, so there must be two potassium ions for every one oxide ion to balance the charges.
Oxide ions have a charge of -2.
In magnesium oxide, the magnesium ions (Mg2+) and oxide ions (O2-) are held together by ionic bonds. The magnesium ions are positively charged and attract the negatively charged oxide ions, forming a strong bond between them. The attraction between the ions keeps them together in a stable crystal lattice structure.
Chromium oxide is the light green inorganic compound coCr203. When dissolved in acid, it produces the hydrated chromium ions [Cr(H2O)6]3+.
Oxygen is the element that reacts to form oxide ions. Oxygen typically gains two electrons to become the oxide ion (O2-).
Nickel oxide is Ni(III)2O3, which does balance.
The difference is magnesium oxide contains oxide ions ,whereas aluminium oxide doesn't.