[DOC] [TLE] Relative atomic mass - Wikipedia [PAR] Relative atomic mass (symbol: Ar) is a dimensionless physical quantity, the ratio 
of the average ... However, relative atomic mass covers more than standard 
atomic weights, and is a less ... This uncertainty reflects natural variability in 
isotopic distribution for an element, rather than uncertainty in measurement (
which is much... [DOC] [TLE] Atomic mass - Wikipedia [PAR] The atomic mass (ma) is the mass of an atomic particle, sub-atomic particle, or 
molecule. It is commonly expressed in unified atomic mass units (u) where by ... 
For atoms, the protons and neutrons of the nucleus account for almost all of the ... 
Standard atomic weight is related to atomic mass by the abundance ranking of... [DOC] [TLE] Atomic Mass - Shmoop Chemistry [PAR] Learning and teaching resource for Atomic Mass written by PhD students ... The 
first step is to assign a mass value to a chosen element to act as a standard. ... 
could create a new scale system that compares our weight relative to others. ... 
Average atomic mass of carbon = (0.9890)(12.000 amu) + (0.0110)(12.00335 
amu) [DOC] [TLE] Calculating Molar Mass, Molecular Formula, Mass Formula ... [PAR] Hence, 1 atomic mass unit is equal to 1/12th of the mass of one atom of C-12. ... 
We can check the atomic mass of other elements with respect to these standard 
elements. .... A molecular shows all the physical and chemical properties of that 
matter. .... with the mass of an atom of 6C12 which is arbitrarily assigned as 
12.000. [DOC] [TLE] Atomic theory: atoms, elements, nucleus - Chem1 [PAR] May 13, 2016 ... The element is the fundamental unit of chemical identity. ... Lav's other mis-
assignment of the elements in the bottom section was not really his fault. ..... 
Almost all of the mass of an atom is contained within a tiny (and therefore .... 
combining weights to estimate the relative weights of the others he studied. [DOC] [TLE] Stoichiometry: Chemical Formula Calculations Lecture [PAR] Chemical formulas are used to present the ratios of atoms of each element in a 
compound. ... have been helped if Dalton and the others had listened to Amedeo 
Avogadro. ... that it assigned as its relative atomic weightthat is, the common 
unit for ... Using the carbon-12 standard, atomic masses have been measured 
for... [DOC] [TLE] The carbon-12 scale of atomic masses [PAR] ... element-being the measured property of its atomic mass with respect ... which 
the atomic weights of all elements would refer ... as standard and assign the 
value of unity to its atomic weight. ... 12.000 516 ... The unit of the physical scale 
is called the "absolute mass ..... others, the masses of which can be determined 
from. [DOC] [TLE] Scan of the first chapter of the Chemistry AP textbook [PAR] were assigned to a new species, Homo erectus pekinensis, commonly ... People 
have been brewing beer for at least 12,000 years, sinc the time ..... ern 
experiments have shown that not all atoms of an element are exactly the same .... 
1.4 in units of grams, the fundamental unit for measurement of mass. ..... The 
standard. [DOC] [TLE] Chapter One [PAR] were assigned to a new species, Homo erectus pekinensis, commonly ... People 
have been brewing beer for at least 12,000 years, since the time ..... ern 
experiments have shown that not all atoms of an element are exactly the same .... 
1.4 in units of grams, the fundamental unit for measurement of mass. ..... The 
standard. [DOC] [TLE] physical-chem - Atomic Structure I. Atomic structure A. B. Different ... [PAR] Mass spectrometer a) Determination of atomic mass b) Determination of ..... 
Carbon-12 scale  A scale in which Carbon-12 isotope is chosen as the standard 
and 12 units is assigned to it by definition. ... Measurement of isotopic masses of 
an element. .... Only 238 nuclei are stable, all others exhibit some kind of 
radioactivity. [DOC] [TLE] Early Atomic Theory and Structure Empedocle (440 BC): all matter ... [PAR] 2. atoms of the same element are alike in mass and size.

Question: This element, assigned atomic mass unit of 12.000, is the standard from which all others are measured
Answer: carbon