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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 ?
Cual es la causa de que los atomos interaccionen y formen un enlace?
4] por el hecho de tener tantos atomos de hidrogeno, de azufre y de oxigeno.
Dos unidades de ligante S,S(+)H2cpse estan coordinados a cada centro metalico, y la molecula de agua que se encontraba en la posicion apical en el sistema trinuclear fue reemplazada por una molecula de tiocianato, coordinada por el atomo de nitrogeno.
El haz generado es amplificado a medida que mas atomos excitados son estimulados a emitir su exceso de energia con cada paso de la radiacion por la camara resonante.
ACIDOS GRASOS PROMEDIO INTERVALO PROMEDIO p INTERMEDIARIOS CONTROLES CONTROLES VLCAD-M (nmol/mg proteina/72 h) D2C12:1 3,6 2,8-4,2 2,9 -- D2C14:1 2,9 1,9-5,1 20,1 0,0234 D2C16:1 3,2 2,5-3,8 10,9 0,0148 Abreviaturas: Acidos grasos deuterados de 12 atomos de carbono (D2C12:1) dodecenoico deuterado; de 14 atomos de carbono (D2C14:1) tetradecenoico duterado; de 16 atomos de carbono (D2C16:1) hexadecenoico deuterado, producto de la degradacion del acido oleico deuterado.
Es sabido que la coordinacion de los atomos de azufre o nitrogeno promueve el rompimiento de los enlaces C-S o C-N por adicion nucleofilica e insercion espontanea de los atomos metalicos dentro de esos enlaces [10].
Sin embargo, la explicacion que Einstein brindo en 1905 sobre el movimiento aleatorio de particulas en un fluido, conocido como movimiento browniano, inclino la balanza en favor de la existencia real de los atomos y las moleculas para buena parte de los actores del debate.
Me hubiera admirado que usted hubiera aducido a Epicuro, Democrito, Lucrecio o a alguno de los atomistas y defensores de los atomos.
Los atomos de Fe estan sufriendo, entonces, una alteracion de su entorno cristalino que esta relacionado con su campo hiperfino medio circundante.
It's called Atomos and promises to showcase all the attributes we've come to associate with him.