Chapter 03 Atoms and Molecules Questions-02
Questions
1. Define the atomic mass unit.
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Answer
One atomic mass unit (amu) is a mass unit equal to exactly onetwelfth (1/12th) the mass of one atom of carbon-12.’ The relative atomic masses of all the elements have been found with respect to an atom of carbon-12.
2. Why is it not possible to see an atom with naked eyes?
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Answer
As an atom is extremely small in size, it is not possible to see it with naked eyes.
Generally radius of an atom is of the order of nanometres. For example, atomic radius of hydrogen atom is $10-10 m$ (or $10-1 nm$ ).
