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(a) Define atomic mass unit. What is its symbol? 

(b) Define atomic mass of an element. 

(c) What is meant by saying that ‘the atomic mass of oxygen is 16’?

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(a) One atomic mass unit is defined as exactly one-twelfth the mass of an atom of carbon-12. Its symbol is ‘u’. 

(b) The atomic mass of an element is the relative mass of its atom as compared with the mass of a carbon-12 atom taken as 12 units.

(c) It means that one atom of oxygen is 16 times heavier than 1/12 of a C-12 atom.

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