These atoms are then called ions. The following sections describe contexts in which ions feature prominently; these are arranged in decreasing physical length-scale, from the astronomical to the microscopic. However, the magnitude of the charge is omitted for singly charged molecules/atoms; for example, the sodium cation is indicated as Na+ and not Na1+. Negative Ion - Occurs when an atom gains an electron (negative charge) it will have more electrons than protons. As reactive charged particles, they are also used in air purification by disrupting microbes, and in household items such as smoke detectors. Information and translations of -ion in the most comprehensive dictionary definitions resource on the web. An ion is a molecule with a positive or negative charge. An ion (/ˈaɪɒn, -ən/)[1] is a particle, atom or molecule with a net electrical charge. Ion Definition in Chemistry. In chemistry, bivalent is an older term for divalent, meaning an atom or ion with a valence of two. For example, Cl- is the symbol for the chlorine anion, which carries a single negative charge (-1). For example, sodium has one valence electron in its outermost shell, so in ionized form it is commonly found with one lost electron, as Na+. In other words, there is an imbalance in the number of protons (positively charged particles) and electrons (negatively charged particles) in a chemical species. Contributing structures of the carbonate ion In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures (or forms, also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory. Because ions are electrically charged, they are affected by magnetic fields. Ion Definition in Chemistry Submitted by Walter Rader (Editor) from Sacramento, CA, USA on Dec 17 2010. acronym for "in other news". If an ion consists of a single atom, it is called a monatomic ion. The resulting compound is called an ionic compound, and is said to be held together by ionic bonding. Polyatomic ion definition: A polyatomic ion is an ion composed of two or more atoms. If the charge in an organic ion is formally centred on a carbon, it is termed a carbocation (if positively charged) or carbanion (if negatively charged). Ion definition is - an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons. Positively charged ions are called cations; negatively charged ions, anions. The Roman numeral designates the formal oxidation state of an element, whereas the superscripted Indo-Arabic numerals denote the net charge. Negatively charged ions are called anions, and positively charged ions are called cations. Ion is a form of John. The negative charge of an ion is equal and opposite to charged proton(s) considered positive by convention. Although Faraday could not identify the particles moving between electrodes, he knew that metals dissolved into a solution at one electrode and that another metal was deposited from the solution at the other electrode, so matter had to be moving under the influence of an electrical current. If only a "+" is present, it means the charge is +1. In other words, there is an imbalance in the number of protons (positively charged particles) and electrons (negatively charged particles) in a chemical species. Examples of Anions Atoms will gain or lose electrons depending on which action takes the least energy. The atom then loses or gains a "negative" charge. The ionizing effect of radiation on a gas is extensively used for the detection of radiation such as alpha, beta, gamma, and X-rays. Cations ; anions repel other anions are both polyatomic ions, USA on Dec 2010.. 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