CBSE Class 9 Answered
(i) Define the term 'atomic mass unit'. How is it linked with relative atomic mass?
(ii) How do we know the presence of atoms if they do not exist independently for most of the elements?
Asked by Topperlearning User | 09 May, 2014, 02:06: PM
Expert Answer
(i) One atomic mass unit is a mass unit equal to exactly 1/12th the mass of one atom of C-12.
The relative atomic mass of the atom of an element is the average mass of the atom, as compared to 1/12th the mass of one carbon - 12 atom.
(ii) Atoms of most elements are not able to exist independently. However, they form molecules and ions which aggregate in large numbers to form matter which we can see, feel or touch and hence we know of their presence.
Answered by | 09 May, 2014, 04:06: PM
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