Define atomic weight. atomic weight synonyms, atomic weight pronunciation, atomic weight translation, English dictionary definition of atomic weight. n. The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which
Atomic weight definition: the average weight of an atom of an element, formerly based on the weight of one hydrogen atom taken as a unit or on 1/16 (0.0625) the weight of an oxygen atom, but after 1961 based on 1/12 the weight of the carbon-12 atom. Abbr
atomic weight, ratio of the average mass of a chemical element’s atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. An isotope is one of two or more species of atoms of the same chemical element ...
molecular weightthe weight of a molecule of a chemical compound as compared with the weight of an atom of carbon-12; it is equal to the sum of the weights of its constituent atoms and is dimensionless. Abbreviated Mol wt or MW. Although widely used, the term is not technically correct; ...
AtomcarbonConstantPlease note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Atomic weight is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a given source) to 1/1...
英语mass与weight有什么不同 mass 英[mæs] 美[mæs] n. 大量,大多; 块,堆,团; [物理学] 质量; 弥撒曲; vt. (使) 集中,聚集; adj. 大规模的; 群众的; 整个的; 集中的; [例句]Ideas on combating mass unemployment对付大量失业的点子[
the average weight of a molecule of an element or compound measured in units based on 1/12 the weight of the carbon-12 atom; the sum of the atomic weights of all the atoms in a molecule.Abbr.:mol. wt. [1875–80] Random House Kernerman Webster's College Dictionary, © 2010 K Dicti...
It is defined to be 1/12 of the mass of one atom of carbon-12 and in older works is also abbreviated as "amu". Also, important in this field is Avogadro's number (NA) or Avogadro's constant (6.0221 x 1023). The term "mole" is defined in that one mole of a substance with ...
(ag, ags)The prefix "atto" means 1/1,000,000,000,000,000,000 = 10−18, so 1,000,000,000,000,000,000 ag = 1018ag = 1 g. 1000 ag = 1 femtogram. 1 ag = 10−21kg. For comparison, one atom of carbon weighs approximately 2·10−23g so 50,000 atoms of carbon weigh ...
The atomic numbers of some of the most famous atoms are hydrogen (1), oxygen (8), carbon (6), nitrogen (7), and gold (79) as seen in the picture. The number in parenthesis is the atomic number and also the number of protons that would be in a single atom of that element. Eleme...