What is the oxygen ion?
Oxygen, O. Oxygen is in Group 6. It has six electrons in its outer shell. It gains two electrons from one or two other atoms in reactions, forming an oxide ion, O2−. An oxide ion has the same electronic structure as a neon atom (Ne).
Thus, an energetic electron passing near or through an oxygen molecule, O2, may force one of the electrons out of the molecule. The result is an ion pair consisting of the positive oxygen ion, O2+, and the negative detached electron, e-.
- A neutral chlorine atom, for example, contains 17 protons and 17 electrons. By adding one more electron we get a negatively charged Cl- ion with a net charge of -1. The gain or loss of electrons by an atom to form negative or positive ions has an enormous impact on the chemical and physical properties of the atom.
- The charge attributed to ions is ionic charge and it is due to the gain or loss of electrons. This is not the same as a particle that may have a charge. Particle charge is due the adsorption of charged species. In fact the silver particles found in colloidal silver are negatively charged, not positive like the ions.
- Ion Examples. An ion is an atom or group of atoms where the number of electrons is not equal to the number of protons. When an atom loses or gains electrons, a positive or negative charge is the result. If electrons are gained, the ion is a cation and when electrons are lost, it is an anion.
Oxygen has 6 valence electrons. To fill up the valence shell, which (when in oxygen's row) has 8 electrons, an oxygen atom wants to gain 2 electrons. Since every electron has a single negative charge, the addition of two electrons results in an oxygen ion with a charge of −2 .
- An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
- The charge on the ion is written as a superscript after the element symbol. For example chlorine gains one electron to form chloride, Cl1-. Sulfur gains two electrons to form sulfide, S2-. You can predict the negative charge on an anion by looking at the group number for the atom.
- The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
The covalent bonds are therefore polar, and the oxygen atoms have a slight negative charge (from the presence extra electron share), while the hydrogens are slightly positive (from the extra un-neutralized protons). Opposite charges attract one another.
- Thus, an energetic electron passing near or through an oxygen molecule, O2, may force one of the electrons out of the molecule. The result is an ion pair consisting of the positive oxygen ion, O2+, and the negative detached electron, e-.
- Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. The amount of a substance that can dissolve in a liquid (at a particular temperature) is called the solubility of the substance.
- The outer shell of magnesium have two electrons it really ”wants” to “give” away the two electrons so if magnesium react with other elements magnesium “gives” away the two electron and magnesium have an ion of 2+ charge here's an example of magnesium oxide the magnesium gives two electron to oxygen and magnesium have a
Updated: 2nd October 2019