In Bohr’s atomic model, the radius of a revolving electron in the nth orbit is the distance from the nucleus where the electron revolves. It is given by:

rₙ = n²h² / (4π²me²Z)

where n is the orbit number, h is Planck’s constant, m is the electron mass, e is the electron charge, and Z is the atomic number. The radius increases with higher energy levels (larger n).

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