News tagged with ions
New nanostructure for batteries keeps going and going
(Phys.org) -- For more than a decade, scientists have tried to improve lithium-based batteries by replacing the graphite in one terminal with silicon, which can store 10 times more charge. But after just a ...
May 11, 2012 |
4.8 / 5 (67) |
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New power source discovered
(PhysOrg.com) -- Researchers at the Massachusetts Institute of Technology (MIT) and RMIT University have made a breakthrough in energy storage and power generation.
Technology / Energy & Green Tech
Feb 10, 2012 |
4.6 / 5 (57) |
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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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Antihelium-4: Physicists nab new record for heaviest antimatter
(PhysOrg.com) -- Members of the international STAR collaboration at the Relativistic Heavy Ion Collider -- a particle accelerator used to recreate and study conditions of the early universe at the U.S. Department ...
Apr 24, 2011 |
4.7 / 5 (23) |
11
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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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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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Northwestern research team turns theory of static electricity on its head
(PhysOrg.com) -- Bartosz Grzybowski, a physical chemist at Northwestern University, and his team of colleagues offer evidence in a paper published in Science, that shows that what scientists have believed to be ...
Jun 29, 2011 |
4.6 / 5 (20) |
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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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Details of new type of electric car battery released
(PhysOrg.com) -- After being spun off from parent company A123 Systems last year; the new offspring, 24M has published a paper in Advanced Energy Materials, ending months of speculation about what it has be ...
May 27, 2011 |
4.4 / 5 (19) |
25
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New entropy battery pulls energy from difference in salinity between fresh water and seawater
(PhysOrg.com) -- A team of researchers, led by Dr. Yi Cui, of Stanford and Dr. Bruce Logan from Penn State University have succeeded in developing an entropy battery that pulls energy from the imbalance of ...
Nanotechnology / Nanomaterials
Mar 25, 2011 |
4.6 / 5 (18) |
27
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NASA's new ion engine ready for missions in space
(PhysOrg.com) -- A small robotic surveyor arrives to explore a near-Earth asteroid. Another robotic spacecraft is returning to Earth with a pristine comet surface sample. Meanwhile, a robotic explorer is approaching ...
Space & Earth / Space Exploration
Apr 15, 2011 |
4.8 / 5 (17) |
8
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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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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) |
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Physicists observe antihelium-4 nucleus, the heaviest antinucleus yet
(PhysOrg.com) -- In 1932, scientists observed the first antimatter particle, a positron (or antielectron). Since then, scientists have observed heavier and heavier states of antimatter: antiprotons and antineutrons ...
Mar 22, 2011 |
4.6 / 5 (17) |
5
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Improving batteries' energy storage
MIT researchers have found a way to improve the energy density of a type of battery known as lithium-air (or lithium-oxygen) batteries, producing a device that could potentially pack several times more energy ...
Technology / Energy & Green Tech
Jul 25, 2011 |
4.9 / 5 (15) |
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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.
