1.The total number of protons and neutrons (nucleons) in the nucleus of an atom. 2.The number of nucleons (protons and neutrons) in the nucleus of an atom. Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited ...
What is the mass number of the uranium-238 atom? What is the mass number of chlorine? What is lithium's mass number? How many valence electrons does radon have? What is the mass number of an oxygen atom with 7 neutrons? What is the atomic mass number of nitrogen?
If an atom has 17 electrons, 20 neutrons, and 19 protons, what is its approximate atomic mass? What is the average mass of one S atom? What is the average atomic mass of a chlorine atom in atomic mass units? Define the following term: Atomic mass. ...
The periodic table of the elements assigns one place to every atomic number, and each of these places is labeled with the common name of the element, as, for example, calcium, radon, or uranium. Not all the atoms of an element need have the same number of neutrons in their nuclei. In...
The universal mass unit, abbreviated u (sometimes amu for atomic mass unit), is defined as one-twelfth of the mass of the 12C atom which has been defined to be exactly 12 u. The absolute mass of a 12C atom is obtained by dividing the value 12 by the Avogadro number (NA = 6.022 137...
Uranium has two primordial isotopes (uranium-238 and uranium-235). Uranium-238 has 92 protons plus 146 neutrons and uranium-235 92 protons and 143 neutrons.Pallava Bagla/Getty Images Atomic mass (ma) is the mass of an atom. Asingle atomhas a set number of protons and neutrons, so the ...
(Chemistry) the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12. Symbol: Ar Abbreviation: r.a.m. Former name: atomic weight Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © Harper...
Direct mass measurements above uranium bridge the gap to the island of stability.doi:10.1038/nature08774The mass of an atom incorporates all its constituents and their interactions. The difference between the mass of an atom and the sum of its building blocks (the binding energy) is a ...
relative atom... atomic weight atomic mass noun Synonyms for atomic mass noun(chemistry) the mass of an atom of a chemical element expressed in atomic mass units Synonyms atomic weight relative atomic mass Related Words mass combining weight ...
Atomic mass, the quantity of matter contained in an atom of an element. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units. In this scale, 1 atomic mass unit (amu) corresponds to 1.66