For the natural isotopic composition of each element it shows "name", "atomic number", "symbol", "atomic weight" (orrelativeatomicmass) and a link to the element's "isotopes".
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It is numerically equal to therelativeatomicmass(or atomic weight) in grams.
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However, atomic weight, ie,relativeatomicmass, is a dimensionless quantity, and can not take the units of grams per mole.
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Si, which has arelativeatomicmassof.
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Its isotopic composition would be measured with a mass spectrometer to determine its averagerelativeatomicmass.
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The term "atomic weight" is being phased out slowly and being replaced by "relativeatomicmass", in most current usage.
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Therelativeatomicmass(a weighted average) of these isotopes is the atomic weight listed for the element in the periodic table.
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It is fixed by the definitions of the mole and ofrelativeatomicmass.
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Another way of stating this, is that, for these elements, therelativeatomicmassand atomic mass are the same.
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The electronrelativeatomicmassalso enters into the calculation of all other relative atomic masses.
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This gives chlorine arelativeatomicmassof 35.5 (actually 35.4527 g/mol).
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Objectors to the name usually prefer the termrelativeatomicmass(not to be confused with atomic mass).
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The calculation is exemplified for silicon, whoserelativeatomicmassis especially important in metrology.
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For example, every atom of oxygen-16 is expected to have exactly the same atomic mass (relativeatomicmass) as every other atom of oxygen-16.
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Both the terms "relativeatomicmass" and "atomic weight" are sometimes loosely used to refer to a technically different standardized expectation value, called the standard atomic weight.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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