In chemistry, iron(II) refers to the element iron in its +2 oxidation state. In ionic compounds (salts), such an atom may occur as a separate cation (positive ion) denoted by Fe2+. 2. The adjective “ferric” is used instead for iron(III) salts, containing the cation or Fe3+.

Thus, Fe2+ is called the iron(II) ion, while Fe3+ is called the iron(III) ion. This system is used only for elements that form more than one common positive ion….Naming Ions.

When naming ionic compounds which contain metal ions capable of forming more than one kind of cation, the Roman numeral after the metal’s name indicates the charge. Therefore, the iron cation in iron(II) chloride has a charge of 2+ , and the charge on the iron cation in iron(III) chloride has a charge of 3+ .

Some ions are atomic, like Al3+ or F–, but there are also polyatomic ions. A polyatomic ion is a particle made of more than one atom, which collectively carries an ionic charge….Part B: Predicting the Formula of an Ionic Compound.

Polyatomic ions are a set of covalently bonded atoms that have an overall charge, making them an ion. Polyatomic ions form ionic bonds in the typical way, balancing so that the overall compound is electrically neutral.

Positively charged ions are called cations; negatively charged ions, anions. …

A cation is a positively charged ion with fewer electrons than protons while an anion is negatively charged with more electrons than protons. Because of their opposite electric charges, cations and anions attract each other and readily form ionic compounds.

In science, a cation is an ion, or charged particle, with a positive charge. In other words, a cation has more protons than electrons. When an ion’s charge is negative, it’s more specifically called an anion, and when it’s positive, you can use the term cation.

Cations form when an element or group of elements (compounds) lose one or more electrons. In figure one, the sodium atom has 11 electrons. When sodium loses one electron, it becomes a +1 cation as shown in figure two. The +1 sodium cation now has 10 electrons, so it is smaller in size than when it had 11 electrons.

Cations (positively-charged ions) and anions (negatively-charged ions) are formed when a metal loses electrons, and a nonmetal gains those electrons. The electrostatic attraction between the positives and negatives brings the particles together and creates an ionic compound, such as sodium chloride.

Cations form when an atom loses one or more electrons. The resulting cation has the electron configuration of the noble gas atom in the row above it in the periodic table.

The main known forms of the element are white, red, and black phosphorus. In addition, there are hundreds of compounds in which phosphorus is present as an anion, a negatively charged ion. Some of these compounds have very useful properties.

An ion is an atom or a group of atoms in which the number of electrons is different from the number of protons. If the number of electrons is less than the number of protons the practical is a positive ion, also called a cation. Ex : sodium ion Na+ , chloride ion cl- , and oxide ion O2 -.

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