News tagged with ions
New energy storage device could recharge electric vehicles in minutes
(PhysOrg.com) -- It has all the appearances of a breakthrough in battery technology, except that it’s not a battery. Researchers at Nanotek Instruments, Inc., and its subsidiary Angstron Materials, Inc., ...
Aug 19, 2011 |
4.8 / 5 (53) |
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Two atoms entangled using microwaves for the first time
Physicists at the National Institute of Standards and Technology have for the first time linked the quantum properties of two separated ions (electrically charged atoms) by manipulating them with microwaves ...
Aug 10, 2011 |
4.8 / 5 (17) |
38
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Energy storage device fabricated on a nanowire array
In a vivid demonstration of the progress being made in miniaturizing energy storage devices, a team of engineers from Rice University in Houston, Texas, has fabricated an energy storage device where all essential ...
Aug 01, 2011 |
4.4 / 5 (14) |
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Electron hopping in graphene oxide leads to highly sensitive sensing
(Phys.org) -- Graphene has many promising applications on its own, but pairing the two-dimensional material with the semiconductor titanium dioxide (TiO2) extends its capabilities even further. A team of ...
Nanotechnology / Nanomaterials
May 17, 2012 |
5 / 5 (4) |
6
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Engineers develop novel system for producing conductive films
(Phys.org) -- Yale engineers have developed a novel automated system for generating strong, flexible, transparent coatings with promising uses in lithium-ion battery and fuel cell production, among other applications.
Nanotechnology / Nanomaterials
May 07, 2012 |
5 / 5 (2) |
0
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H3+: The molecule that made the Universe
(Phys.org) -- In a study that pushed quantum mechanical theory and research capabilities to the limit, University of Arizona researchers have found a way to see the molecule that likely made the universe - ...
Apr 12, 2012 |
4.6 / 5 (18) |
9
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A star explodes, turns inside-out
(PhysOrg.com) -- A new X-ray study of the remains of an exploded star indicates that the supernova that disrupted the massive star may have turned it inside out in the process. Using very long observations ...
Mar 29, 2012 |
4.8 / 5 (14) |
7
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Graphene battery demonstrated to power an LED
(PhysOrg.com) -- Scientists in Hong Kong have reported, in ArXiv, their experiments to make a graphene battery that they say generates an electrical current by drawing on the ambient thermal energy in the sol ...
Nanotechnology / Nanomaterials
Mar 16, 2012 |
4.1 / 5 (25) |
24
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Unique salt allows energy production to move inland
Production of energy from the difference between salt water and fresh water is most convenient near the oceans, but now, using an ammonium bicarbonate salt solution, Penn State researchers can combine bacterial ...
Technology / Energy & Green Tech
Mar 01, 2012 |
4.5 / 5 (15) |
2
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Elusive matter found to be abundant far above Earth
(PhysOrg.com) -- Cold plasma has been well-hidden. Space physicists have long lacked clues to how much of this electrically charged gas exists tens of thousands of miles above Earth and how the stuff may impact our planet's ...
Space & Earth / Space Exploration
Jan 24, 2012 |
4.9 / 5 (12) |
15
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RNA editing responsible for colder water survival in octopus
(PhysOrg.com) -- Researchers have discovered that when it comes to the survival of an octopus living in frigid waters, the reasoning is not a difference in the gene DNA but rather a difference in the RNA editing.
Jan 06, 2012 |
5 / 5 (1) |
0
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New technology improves both energy capacity and charge rate in rechargeable batteries
Imagine a cellphone battery that stayed charged for more than a week and recharged in just 15 minutes. That dream battery could be closer to reality thanks to Northwestern University research.
Nov 14, 2011 |
4.8 / 5 (18) |
17
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New record voltage for organic solar cells opens the tech to consumer electronics
Molecular Solar Ltd, a spinout company from the University of Warwick, has achieved a significant breakthrough in the performance of solar photovoltaic (PV) cells. They have achieved and demonstrated a record ...
Technology / Energy & Green Tech
Oct 17, 2011 |
4.1 / 5 (12) |
7
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Sulfur in hollow nanofibers overcomes challenges of lithium-ion battery design
(PhysOrg.com) -- Stanford researchers have used nanotechnology to invent a better lithium ion battery cathode.
Nanotechnology / Nanomaterials
Oct 05, 2011 |
5 / 5 (14) |
8
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Proton-based transistor could let machines communicate with living things
Human devices, from light bulbs to iPods, send information using electrons. Human bodies and all other living things, on the other hand, send signals and perform work using ions or protons.
Sep 20, 2011 |
4.9 / 5 (20) |
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Ion
An ion is an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge.
Since protons are positively charged and electrons are negatively charged, if there are more electrons than protons, the atom or molecule will be negatively charged. This is called an anion (pronounced /ˈænaɪən/; an-eye-on), from the Greek ἀνά (ana), meaning 'up'.
Conversely, if there are more protons than electrons, the atom or molecule will be positively charged. This is called a cation (pronounced /ˈkætaɪən/; cat-eye-on), from the Greek κατά (kata), meaning 'down'.
An ion consisting of a single atom is called a monatomic ion. If it consists of two or more atoms, it is called a polyatomic ion. Polyatomic ions containing oxygen, such as carbonate and sulfate, are called oxyanions.
When writing the chemical formula for an ion, its charge is written as a superscript '+' or '−' following a number indicating the difference between the number of protons and the number of electrons. The number is omitted if it is equal to 1. For example, the sodium cation is written as Na+, the '+' indicating that it has one less electron than it has protons. The sulfate anion is written as SO42−, the '2−' indicating that it has two more electrons than it has protons.
If an ion contains unpaired electrons, it is called a radical ion. Just like neutral radicals, radical ions are very reactive.
For more information about Ion, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
