An ion has an electrical charge because it either has more electrons than protons or it has more protons than electrons. Electrons, which are found in the shells of an atom, have a negative charge, while protons, found i... More »

The formal charge of the sulfate ion, which has the molecular formula (SO4)2-, is -2. Ions that have a negative charge are called anions, and positively charged ions are called cations. More »

A sulfide ion has a fixed charge of 2-. It is one of the common anions formed by the chemical element sulfur. More »

The protons, neutrons and electrons present in an ion are determined from a periodic table. The atomic number represents the protons in an element. The atomic mass minus the atomic number represents the neutrons. In a ne... More » Science Chemistry Atoms & Molecules

The most common magnesium ion has a +2 charge, which means it has lost two of its original 12 electrons, leaving it with a total of 10 electrons. The atomic number of magnesium is 12, which means that in its stable state... More »

A metallic bond forms when the valence electrons are not associated with a particular atom or ion. Instead, they exist as a "cloud" of electrons around the ion centers. More »

A phosphide ion is an negatively charged potassium atom that has three additional electrons in its outermost shell. Phosphide ions are nonmetallic and can chemically react with a variety of metallic elements to form ioni... More »