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Thread: atomic weight/mass

  1. #1 atomic weight/mass 
    Forum Senior anand_kapadia's Avatar
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    Is there any difference bw atomic mass and atomic weight.

    and also difference bw relative atomic mass and standard atomic weight.


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  3. #2  
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    Atomic weight and atomic mass are the same, the former being the old-fashioned and obsolete term.

    Relative atomic mass and standard atomic weight probably mean the same thing, unless the author tries to make some obscure distinction of his own.

    Note that the atomic mass scale changed a few decades ago. Formerly the reference standard was oxygen = 16. Now the single isotope carbon-14 is the reference. That accounts for the slight differences between old and modern tables.
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    w = m * g
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    Quote Originally Posted by georginho_juventusygr
    w = m * g
    That does not apply to this question.

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    Quote Originally Posted by SteveF
    Quote Originally Posted by georginho_juventusygr
    w = m * g
    That does not apply to this question.

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    Euh ... I somewhat remember this. But why?
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    Atomic weight or atomic mass is merely a relative measure. Starting 200 years ago, an atom of hydrogen was assigned a "weight" of 1.00 and every other element was given a "weight" relative to hydrogen. (Later, oxygen = 16 became the standard. Now it is carbon-14.)

    But regardless of whether we are talking about atomic weight or atomic mass, all values are simply calculated relative to our standard. They are neither true weights nor true masses.

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  8. #7  
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    It’s carbon-12, not carbon-14.
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    Quote Originally Posted by JaneBennet
    It’s carbon-12, not carbon-14.
    Agreed.



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  10. #9  
    Forum Senior anand_kapadia's Avatar
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    and what is atomic mass ratio
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    Quote Originally Posted by anand_kapadia
    and what is atomic mass ratio
    This is just another term for atomic mass, since all values in the table are not true masses but a ratio compared to our standard.

    I suppose you can also apply mass ratio to subatomic particles, such as referring to the proton-electron mass ratio.

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