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The Bohr radius of the fifth electron of...

The Bohr radius of the fifth electron of phosphorous atom (atomic number = 15) acting as a dopant in silicon (relative dielectric constant = 12) is …….. Å

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The correct Answer is:
c
The fifth valance electron of phosphorous is in its third shell i.e. , `n = 3` For phosphorous `Z = 15`. Also , the Bohr's radius for `n^(th)` orbit
`r_(n) = (n^(2)/(Z) epsilon r) r_(0) = (3^(2))/(15) xx 12 xx 0.529 Å = 3.81 Å`
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