Could another atom be used as the standard for amu?

In summary: The atomic mass unit concept was developed before it was discovered that the chemical elements have various isotopes. Prior to 1929, it was though that oxygen had only one isotope, oxygen-16, which comprises more than 99% of the oxygen found on earth. In 1961, the standard mass unit was changed to carbon-12, which was selected because it would cause the least disruption in measurements already made based on the atomic weight of oxygen-16.
  • #1
Tonia
96
0
The atom that is used as the standard for the atomic mass scale is the Carbon atom with an atomic number of 6 and a mass number of 12 and this carbon atom is equal to 12 unified atomic mass units. Could another atom be used as the standard, and if so, how would this be accomplished??
 
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  • #2
This sounds like homework. What is your opinion on the question?
 
  • #3
Sure, any atom could be used. Suppose you wanted to use Lithium 7. Define the mass as exactly 7.0000 amu and then all the other atomic masses get adjusted accordingly.
 
  • #4
Is there a reason you used four zeros?
 
  • #5
Tonia said:
Is there a reason you used four zeros?

Because I was too lazy to type 1000 zeros. Exactly 7.00000000000000000000000000 by definition is exact to whatever precision you like.
 
  • #6
Tonia said:
The atom that is used as the standard for the atomic mass scale is the Carbon atom with an atomic number of 6 and a mass number of 12 and this carbon atom is equal to 12 unified atomic mass units. Could another atom be used as the standard, and if so, how would this be accomplished??
Another atom has been used, before the standard was changed to carbon-12. This atom was oxygen, or more specifically, oxygen-16.

The atomic mass unit concept was developed before it was discovered that the chemical elements have various isotopes. Prior to 1929, it was though that oxygen had only one isotope, oxygen-16, which comprises more than 99% of the oxygen found on earth. In 1961, the standard mass unit was changed to carbon-12, which was selected because it would cause the least disruption in measurements already made based on the atomic weight of oxygen-16.

https://en.wikipedia.org/wiki/Atomic_mass_unit
 
  • #7
You would want the other atom to be readily available, safe to handle, inexpensive, relatively easy to purify, and other convenient qualities. Gee, C-12 meets the criteria! Are you just curious, or do you think there is a problem needing fixing?
 

What is an amu?

An amu stands for atomic mass unit and is a unit of measure used to express the mass of atomic and subatomic particles. It is defined as 1/12th of the mass of a carbon-12 atom.

Why is carbon-12 used as the standard for amu?

Carbon-12 was chosen as the standard for amu because it has a stable and known atomic mass of 12 amu. Additionally, it is a common and abundant element, making it easier for scientists to obtain and use for measurements.

Could another atom have a more accurate amu measurement?

Yes, it is possible that another atom could have a more accurate amu measurement. As technology and scientific knowledge continue to advance, it is possible that a more precise and stable element could be discovered and used as the standard for amu.

Would using another atom as the standard for amu affect previous scientific measurements?

Yes, using another atom as the standard for amu would likely affect previous scientific measurements. However, this change would only affect the precision of the measurements and not the actual values themselves. Scientists would need to recalibrate their instruments and adjust their calculations to account for the new standard.

What are the potential benefits of using another atom as the standard for amu?

Using another atom as the standard for amu could potentially lead to more precise and accurate measurements in the fields of chemistry and physics. It could also help to expand our understanding of the fundamental properties of atoms and their interactions.

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