Atomic weight

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Atomic mass
The atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units. The atomic mass may be considered to be the total mass of protonsneutrons and electrons in a single atom (when the atom is motionless). The atomic mass is sometimes incorrectly used as a synonym of relative atomic mass, average atomic mass and atomic weight; however, these differ subtly from the atomic mass. The atomic mass is defined as the mass of an atom, which can only be one isotope at a time and is not an abundance-weighted average. The actual numerical difference is usually very small such that it does not affect most bulk calculations but such an error can be critical when considering individual atoms.
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Atommasse
Als Atommasse (A) (engl. atomic mass), früher Atomgewicht (engl. atomic weight), bezeichnet man die Masse von Atomen chemischer Elemente.Es wird zwischen relativer Atommasse (Ar) (ohne Maßeinheit) und absoluter Atommasse, angegeben in kg, g oder u unterschieden.
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Masa atomowa
Masa atomowa (niepopr. ciężar atomowy) - liczba określająca ile razy masa jednego reprezentatywnego atomu danego pierwiastka chemicznego jest większa od masy 1/12 izotopu 12C, przy czym pod pojęciem 'reprezentatywnego atomu' rozumie się atom o średniej masie wyliczonej proporcjonalnie ze wszystkich stabilnych izotopów danego pierwiastka, ze względu na ich rozpowszechnienie na Ziemi. Masa atomowa jest wyrażana w atomowych jednostkach masy [u].
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Peso atomico
Il peso atomico (indicato spesso con A) o massa atomica è la massa di un atomo di un dato elemento. In questo caso si parla spesso di peso atomico assoluto e viene espresso in grammi: l'ordine dei valori oscilla tra i 10-22g e i 10-24g. Per ovviare al difficile uso di numeri così piccoli nei calcoli, si è convenuto di esprimere la massa atomica in rapporto al peso atomico assoluto di 1/12 dell'atomo 12C, il cui valore è adottato quale unità di massa atomica (u.m.a. o semplicemente u): sperimentalmente si è ricavato che equivale a 1.66053886 x 10-27kg. Questa notazione della massa è nota come peso atomico relativo (o massa atomica relativa, spesso abbreviata in massa relativa) e si può ottenere dalla formula:
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Atoommassa
Zoals de naam aangeeft, is de atoommassa de massa van een atoom, uitgedrukt in atomaire massa-eenheden (u). Elk isotoop van een scheikundig element heeft een andere atoommassa.De atoommassa van een element als geheel is gedefinieerd als het gewogen gemiddelde van de atoommassa's van alle natuurlijke isotopen, waarbij de relatieve aanwezigheid, de mate waarin elk isotoop verhoudingsgewijs voorkomt op aarde, de wegingsfactor is. Dit gemiddelde wordt in tabellen meestal aangeven met de "relative atoommassa"
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