positive ion


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positive ion

[′päz·əd·iv ′ī‚än]
(chemistry)
An atom or group of atoms which by loss of one or more electrons has acquired a positive electric charge; occurs on ionization of chemical compounds as H+from ionization of hydrochloric acid, HCl.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ion

(1) (IDL On the Net) See IDL.

(2) (ION) An NVIDIA graphics platform typically used in Atom-based netbooks. See Intel Atom.

(3) An ion is an atom with fewer or greater electrons than normal as a result of radiation or chemical reaction. A positive ion, called a "cation" (pronounced "cat-eye-en"), has one or more electrons stripped out, which means it has fewer electrons in its electron shells than it has protons in its nucleus. A negative ion, called an "anion" (pronounced "an-eye-en"), is an atom that has one or more electrons forcibly added.

Cations, Anions, Cathodes and Anodes
Although one might think cations are in cathodes and anions are in anodes, the opposite is true. When the terms were coined, the concept was that positive cations were attracted to the negative cathode, and negative anions were attracted to the positive anode.

Batteries Contain Positive and Negative Ions
In a battery, there are positive ions on one side and negative ions on the other. When a conductor is placed in between to complete the circuit, the electrons flow from the negative ions to the positive side where they join the positive ions. See ion deposition.
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It is observed that the linearity of ginsenosides detected in the negative ion mode was better than that in the positive ion mode.
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Specifically, Calcote and King considered only positive ions and electrons in their equilibrium calculations (produced by thermal ionization).
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Since ceramides in positive ion mode MS/MS generate characteristic product ions of m/z 264 and 282, precursor ion scans of m/z 264 and m/z 282 were used for detecting ceramides in the adipose tissue.
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Another one was stimulated by the same iontophoretic device, but the two electrodes were put in opposite positions than the previously discussed one for positive ion stimulation.
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Subscripts i = n and i = p appear for negative and positive ions respectively.
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If the potential is too low the positive ions and the free electrons will recombine before they reach the anode.
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These electrons can be excited to higher energy levels, and at appropriate electron beam energies, the atom can lose that electron producing a positive ion. These ejected electrons are known as secondary electrons.
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The positive ion density was a moderate 2,700/[cm.sup.3] and the negative ion density was 2,400/[cm.sup.3].
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He suggested that dissolved electrolytes were indeed completely dissociated in solution but that each positive ion was attended by a cloud of negative ions, while each negative ion was attended by a cloud of positive ions.
Debye-Huckel equations

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