Atomic Mass Unit


 
 
Concept Explanation
 

Atomic Mass Unit

Atomic Mass Unit: It is defined as the mass unit equal to exactly 1/12th of the mass of one atom of C- 12 isotope. Earlier, it was abbreviated as amu but according to latest recommendations of IUPAC, it is now written as ‘u’— unified mass.

Note : Atoms of most of the elements are not able to exist independently. Atoms form molecules and ions. These molecules or ions aggregate in large numbers to form the matter that we can see, feel or touch.

Examples of values expressed in Atomic Mass Units:

  • A hydrogen-1 atom has a mass of 1.007 u (or Da or amu).
  • A carbon-12 atom is defined as having a mass of 12 u.
  • The largest known protein, titin, has a mass of 3times 10^6 Da.
  • AMU is used to differentiate between isotopes.  An atom of U-235, for eg: has a lower AMU than one of U-238, since they differ by the number of neutrons in the atom.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    What is the full form of "u" according to IUPAC?

    Right Option : C
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    Question : 2

    Which of the following is the atomic mass (amu) of Uranium isotope?

    Right Option : B
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    Explanation
    Question : 3

    Which of the following are correct :

    (a) A carbon-12 atom is defined as having a mass of 12 u.

    (b) The largest known protein, titin, has a mass of 3times 10^6 Da.

    (c) AMU is used to differentiate between elements.

    Right Option : A
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    Explanation
     
     
     


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