Size and Mass of an atom

Here we discuss the size and mass of an atom.

Size of atom:

First, we discuss the size of an atom. It has been observed by the x-ray work in the 20th century,  that size of atoms is so small that it can be imagined by the following calculations.
a) The diameter of the atom is of the is of the order 2 multiply 10 over raised power -10 m . in nanometers 0.2 nanometer.
b) A man breathes approximately 10 power raised to 5 million atoms in a deep breath.
c) If atoms are joined together in a line, two million atoms will be required to cover a full stop.    

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