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atom

 [at´om]
the smallest particle of an element that has all the properties of the element. adj., adj atom´ic.ƒThere are two main parts of an atom: the nucleus and the electron cloud. The nucleus is made up of protons, which carry a positive electrical charge, and (except in hydrogen) neutrons, which contain one proton and one electron and carry no electrical charge. The electron cloud is made up of particles called electrons, which carry a negative electrical charge and move in orbits or “shells” around the nucleus. Different atoms have different numbers of protons, neutrons, and electrons in their makeup.

In a chemical change, atoms do not break up but act as individual units. The chemical behavior of an atom is controlled by the number and spatial arrangement of electrons in orbit around the nucleus. The atoms of radioactive elements are very unstable and are capable of emitting nuclear particles in a stream or “ray;” these particles are called radiations.

The atomic number of an element is the number of free protons (those not in neutrons) in the nucleus; it is equal to the net positive charge of the nucleus. The atomic weight is the weight of an atom of a substance as compared with the weight of an atom of carbon-12, which is taken as 12.

at·om

(at'ŏm),
Formerly considered the ultimate particle of an element, believed to be as indivisible as its name indicates. Discovery of radioactivity demonstrated the existence of subatomic particles, notably protons, neutrons, and electrons, the first two making up most of the mass of the atomic nucleus. It is now known that subatomic particles are further classified into hadrons, leptons, and quarks.
[G. atomos, indivisible, uncut]

at·om

(at'ŏm)
Formerly considered the ultimate particle of an element, believed to be as indivisible as its name indicates. Discovery of radioactivity demonstrated the existence of subatomic particles, notably protons, neutrons, and electrons, the first two comprising most of the mass of the atomic nucleus. We now know that subatomic particles are further divisible into hadrons, leptons, and quarks.
[G. atomos, indivisible, uncut]

atom

the smallest particle of matter possessing the properties of an element.

at·om

(at'ŏm)
Formerly considered the ultimate particle of an element, discovery of radioactivity demonstrated the existence of subatomic particles, notably protons, neutrons, and electrons, the first two making up most of the mass of the atomic nucleus. Subatomic particles are now further classified into hadrons, leptons, and quarks.
[G. atomos, indivisible, uncut]
References in periodicals archive ?
The company will give more details about a dual-core Atom chip code-named Rosepoint, with integrated Wi-Fi capabilities, at the International Solid-State Circuits Conference being held in San Francisco, which started yesterday and runs until Thursday.
Most Atom chips now go into netbooks, but that market has been hurt by tablets.
Intel in 2010 showed an LG smartphone based on the earlier Atom chip code-named Moorestown, but the device never reached customers.
Intel yesterday started shipping the latest Atom chips for netbooks, an important step to sustain growth of the low-cost PCs in the wake of the tablet onslaught.
<p>SGI said the multiple configurations available can include use of an Nvidia graphics processing unit card as well as an Intel low-powered Atom chip. SGI says that Atom chips are being used for application development and testing scale-out application code.
Chandrasekher, who was said to have left "to pursue other interests", led a group responsible for the development of low-power Atom chips for products such as smartphones, tablets and other handheld devices.
Intel will show off systems based on the upcoming netbook platform called Pine Trail, which will include Atom chips with integrated graphics processors.
Intel is already pushing its low-power Atom chips in servers.
Intel yesterday started shipping new low-power Atom chips built on the platform code-named Cedar Trail, with numerous improvements to boost graphics and application performance over their predecessor, the company said.
Intel is also pushing the x86 architecture to tablets with its Atom chips, and hopes to reduce chip power consumption over the next few years to a point where it can match ARM, whose chips are considered more power efficient.
Mini-laptops based on Arm chips are set to make their way to users, which could heat up the battle in a space dominated by netbooks with Intel's Atom chips. <p>Sharp last week announced the PC-Z1, also called the NetWalker, which will be one of the first mini-laptops based on an Arm chip to reach store shelves.
The N470 chip processor will run at a speed of 1.83GHz, making it Intel's fastest chip for netbooks to date.<p>The new processor is based on a new second-generation Atom chip architecture that Intel released in December.