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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 ?
Es necesario que los atomos esten despojados de cualidades sensibles; de lo contrario, estas contaminaran las caracteristicas distintivas de las cosas generadas.
Por uma questao logica, uma vez que se afirmara que os atomos possuiam movimento e se agrupavam para criar as coisas que existem, perceberam deveria haver um vazio por onde os atomos poderiam se mover.
Deteniendonos en la segunda tesis; observamos que si los cuerpos se componen de atomos debe haber algo en ellos que los haga colisionar y componerse o dividirse: Epicuro se refiere a una suerte de "espontaneidad interna" (Garcia Gual, 2002, 140) o "causa intrinseca espontanea" (Oyarzun y Molina, 2005, 9) llamada parenklisis (4) segun la cual los atomos se desvian minimamente de su trayecto, posibilitando asi sus colisiones y con ello la composicion de los cuerpos.
En el segundo, la cara de cristal, formada por mallas de atomos, producira el fenomeno, exactamente como un rayo luminoso al incidir sobre una red, con la diferencia de que siendo tan pequena la longitud de onda de los rayos X no puede ocurrir el fenomeno sino en una escala del orden del diametro atomico, y se produce porque la radiacion incidente origina el salto de un electron de una orbita a otra, con la produccion de energia radiante de la misma longitud de onda.
Generalmente no se presentan las causas de la formacion de enlaces y se justifica la formacion del enlace solamente por la tendencia de los atomos a adquirir la configuracion electronica de gas noble o cumplir la regla del octeto.
Atom AMPD has chosen Dell EMC OEM Solutions to add the AtomOS solution to Dell Edge Gateways and Dell Embedded Box PCs in the US as well as in Southeast Asia via Through Technology Group (TTG) based in Singapore, the company said.
El nota el punto de vista (que mantenian esos filosofos) de que hay algo en todo cambio sustancial que esta siempre ahi: segun la quimica cuasi-moderna, este algo serian los atomos de los elementos presentes, y tanto Tales de Mileto como muchos modernos piensan, evidentemente, que el agua que contribuye a la composicion del cuerpo esta siempre ahi.
Los atomos de nitrogeno se encuentra en posicion trans uno con respecto al otro, de igual forma que los oxigenos de los grupos carboxilato y alcohol.
La clasificacion periodica, basada originalmente en los pesos atomicos de los elementos, enfrenta una crisis a comienzos del siglo XX, cuando se descubre una gran cantidad de isotopos, esto es, atomos de lo que se consideraba un mismo elemento, pero con pesos atomicos diferentes y propiedades macroscopicas ligeramente diferentes.
VTech ErisTerminal telephones have been tested and approved as fully compatible with the VoIP Defender's unique All-In-One communications and network security solution, which uses the AtomOS platform developed by VoIP Defender's parent company AtomAMPD.
Pero, si el choque de los atomos puede crear el mundo, ?por que no puede crear un portico, un templo, una casa o una ciudad, que son cosas menos trabajosas y, desde luego, mucho mas sencillas?