atomic mass

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1. a lump or collection of cohering particles.
2. that characteristic of matter that gives it inertia. Symbol m.
atomic mass atomic weight; see also atomic mass unit.
inner cell mass an internal cluster of cells at the embryonic pole of the blastocyst which develops into the body of the embryo.
lean body mass that part of the body including all its components except neutral storage lipid; in essence, the fat-free mass of the body.
relative molecular mass technically preferable term for molecular weight.

atomic mass (A)

the average mass, relative to an atom of carbon, of an atom of an element based on the natural isotopic mix of that element. Also called atomic weight. See also atomic mass unit.

a·tom·ic mass

(ă-tomik mas)
Total number of protons, neutrons, and electrons in an atom.
References in periodicals archive ?
In order to arrive at a conclusion, the data set of 84 atomic masses was divided into two parts.
It is fact that the "mean atomic mass" of a mononuclidic element is everywhere in the universe exactly the same, while we would expect some variations in the atomic masses of polynuclidic elements when analyzing rock samples obtained from different galaxies.
The improved atomic masses have also added impetus to an effort by NIST researchers to increase the precision of measurements of gamma-ray wavelengths in nuclear processes.
Properties of plain bodies, and also forms and properties of compounds of the elements, have a periodic dependence on the numerical values of the atomic masses of the elements".
Elements of the same Period have very close numerical values of their atomic masses, but different physical and chemical properties.
This tendency still remain upto Bismuth after whom the deviations of actinides experience a positive shift: this means that the numerical values of the atomic masses presented in the Periodic Table are overstated for the region.
Then, after actinides, a region of the atomic masses of the elements of Period 7 (elements 104-118) is located.
Here we adopted Muller's formalism and present the abundance data as a function of the natural logarithm of the atomic masses (here mean values from a periodic table were used) which were previously divided by the lowest atomic weight available (hydrogen).
The objective of this study is to determine the possible number of chemical elements, along with atomic masses and atomic numbers up to the final entry in the Periodic Table.
Let us examine this fact in relation to elements with the following atomic masses (K): beryllium Be (9.