Define relative atomic mass .

Write the name and symbol of the reference element that has been used as a standard substance to define the relative atomic mass.

Explain 'relative atomic mass' .

State why the atomic weight of an element is also termed - relative atomic mass.

Comlete the following table: The relative atomic masses of some elements in the chart below are given. You have to find the relative atomic masses of the others.

(a)Define atomic mass unit. How is it linked with relative atomic mass? (b) How do you know the presence of atoms if they do not exist independently for most of the elements?

Define atomic mass.