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en.wikipedia.org/wiki/Relative_atomic_mass

The IUPAC commission CIAAW maintains a expectation-interval value for relative atomic mass (or atomic weight) ...

www.britannica.com/science/atomic-weight

Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element's atoms to some standard. Since 1961 the standard unit of ...

dl.clackamas.edu/ch104-03/relative.htm

Relative Atomic Weights. Let's look at some of the things you have already learned in this course. You know that elements can combine with one another to form ...

www.school-for-champions.com/chemistry/atomic_weight.htm

Atomic Weight in Chemistry. by Ron Kurtus (revised 30 August 2012). The atomic weight—or more correctly stated: relative atomic mass—of an element is a ...

dl.clackamas.edu/ch104/lesson2atomicweights.html

In this section we will look at those relative atomic weights, how they were based on hydrogen as a standard, and then how and why that standard was changed.

www.webelements.com/periodicity/atomic_weight

"An atomic weight (relative atomic mass) of an element from a specified source is the ratio of the average mass per atom of the element to 1/12 of the mass of ...

www.thefreedictionary.com/atomic+weight

The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic mass units. American Heritage®  ...

www.encyclopedia.com/science-and-technology/chemistry/chemistry-general/atomic-weight

Atomic weights were formerly determined directly by chemical means; now a mass spectrograph is usually employed. The atomic mass and relative abundance ...

www.nist.gov/document-1636

has resulted in changes for the standard atomic weight of 21 elements. ... relative lithium isotope-ratio data, the Commission recommends that such data be ex-.