The Bohr radius of the fifth electron of phosphorous alom `(atomic number = 15)` acting as a dopant in sillcon `(relative dielectric constant = 12)` is …….. Å
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The fifth velence electron of phosphorous is in its third shell , I, e, ` n = 3 ` for phosphorous , ` Z = 15 ` . The Bohr 's radius for nth orbit `= (9n^(2))/(Z) e _(T)) eta = (3^(2))/(15) xx 12 xx 0.529 Å= 3.81 Å`
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