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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]

atom

/at·om/ (at´om) the smallest particle of an element with all the properties of the element; it consists of a positively charged nucleus (made up of protons and neutrons) and negatively charged electrons, which move in orbits about the nucleus.atom´ic

atom

[at′əm]
Etymology: Gk, atmos, indivisible
1 (in chemistry and physics) the smallest division of an element that exhibits all the properties and characteristics of the element. It comprises neutrons, electrons, and protons. The number of protons in the nucleus of every atom of any given element is the same and is called its atomic number.
2
Usage notes: nontechnical,
the amount of any substance that is so small that further division is not possible. atomic, adj.

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.

atom,

n the smallest component of an element that retains the element's chemical properties. Atoms comprise molecules and are themselves divisible into electrons, neutrons, and protons.

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]

atom (at´əm),

n the smallest part of an element capable of entering into a chemical reaction.

atom

the smallest particle of an element that has all the properties of the element.
There 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.
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.
References in periodicals archive ?
Netbooks with the new Atom chips will ship in the fourth quarter, the spokeswoman said.
The team, led by Innsbruck's Jorg Schmiedmayer, used the smallest wires to date for atom chips, although their 10-micrometer width is not thin by electronics standards.
7 Interferometry with Bose-Einstein Condensates on Atom Chips
Right now, Intel's biggest challenge is the lack of an Atom chip with integrated LTE capabilities, said Jack Gold, principal analyst at J.
Having shipped about 70 million Intel Atom chips for netbooks since our launch of the category in 2008, there is obviously a great market for these devices around the world.
It has been noted that Intel's Bay Trail Atom chips offer a 64-bit support and are certified as 'Intel 64' chips,' strengthening the speculation, (http://www.
Some low-power Intel Atom chips are already being used in servers, and Intel is also launching a new line of low-power x86 Atom S-series server chips later this year to further tackle the ARM threat.
lt;p>The new Atom chips are also more power-efficient, which could extend the battery life in some netbooks.
Since introduction, Intel has shipped over 40 million Atom chips for netbooks to every major OEM around the world.
He offers a critical view of the impact of the Iris GPU, saying users will opt for a next-generation gaming console, or a device powered by a mobile processor designed by the British firm ARM or even Intel's refreshed line of Atom chips due to Haswell's higher price.
The new Atom chips also use 10 watts of power, three less than the predecessor chip, Ramamoorthy said.
Cirrus will sell the AToM chips in the merchant market and become a registered applications developer for ATML's ATMoS operating system.