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Write the expression for the radius of n...

Write the expression for the radius of `n^(th)` orbit of the hydrogenic atoms and give the meanings of the symbols used.

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`r=(epsilon _(0)n^(2)h^(2))/(pimZe^(2))` where 'r' is the radius of the orbit, n is the principal quantum number, h is the Planck's constant , m is the mass of an electron, Z its atomic number and e is the quantised unit of charge and `in_(0)` absolute permittivity for air.
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