Is there any differance between atomic mass & atomic weight?
Answer:
Atomic mass :
The atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units. The atomic mass is sometimes incorrectly used as a synonym of relative atomic mass, average atomic mass and atomic weight; however, these differ subtly from the atomic mass. The atomic mass is defined as the mass of an atom, which can only be one isotope at a time and is not an abundance-weighted average. The actual numerical difference is usually very small such that it does not affect most bulk calculations but such an error can be critical when considering individual atoms.
Atomic weight :
Definition: The average mass of the atoms of an element. This is a weighted average of the naturally-occurring isotopes.
-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 that have different atomic numbers (protons + neutrons) and thus different atomic masses.
- Therefore, yes there is difference between atomic mass and atomic weight.
The atomic mass is the mass of an atom at rest, most often expressed in unified atomic mass units.
The relative atomic mass (also known as atomic weight and average atomic mass) is the average of the atomic masses of all the chemical element's isotopes as found in a particular environment, weighted by isotopic abundance. This is frequently used as a synonym for the standard atomic weight and is not incorrect to do so since the standard atomic weights are relative atomic masses, although it is less specific to do so. Relative atomic mass also refers to non-terrestrial environments and highly specific terrestrial environments that deviate from the average or have different certainties (number of significant figures) than the standard atomic weights.
yes there is. I learnt it long time ago when I was in school. Now I don't remember it dear !
http://en.wikipedia.org/wiki/standard_at...
The above site gives an explanation.
mass is not same as weight as weight is calculated in m*g.
that's mean weight contains mass but mass doesn't
w=m*g
w is weight
m is mass
g is constant
Definetly.In simple words you can say that atomic weight in ground state of element is the total numbers of electrons or protons present der in it shells.and atomic mass is the sum of total numbers of neutrons and protons in a nuclie.actually atomic mass represents the total nucleons present.One thing is to be noted that atomic weight is equal to number of protons only, but since in ground state of element numbers of protons and elecrons are equal so they are same but if the element is not in ground state then atomic weight is only equal to number of protons.
The standard atomic weight refers to the mean relative atomic mass of an element .
The atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units.[1] The atomic mass is sometimes incorrectly used as a synonym of relative atomic mass, average atomic mass and atomic weight; however, these differ subtly from the atomic mass. The atomic mass is defined as the mass of an atom, which can only be one isotope at a time and is not an abundance-weighted average. The actual numerical difference is usually very small such that it does not affect most bulk calculations but such an error can be critical when considering individual atoms.
For common public there is no difference in mass and weight. According to definitions of mass and weight, weight is a measure of gravitational Pull on any substance. Weight of a matter on Moon will be about one sixth of the weight on Earth.
Mass is a measurement of matter compared to basic particles of an atom - proton- neutron, electron, and .... meson, photons etc if any is present. (or simple most element - hydrogen that has one proton and one electron only for easy of calculations) Usually mass number is expressed for the elements in periodic table, that is average of mass of all existing isotopes of an element in proportion of their concentration. Mass number will not change on Moon or Mars or anywhere in the universe.
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