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The value of quantum numbers n, 1and for the 5^th electron of Boron will be

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$n = 1, 1 = 0, m = - 1$

$n = 2, 1 = 1, m = - 1$

$n = 1, 1 = 2, m = - 1$

answer is B.

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Detailed Solution

$_{5} B = 1 s^{2}, 2 s^{2}, 2 {p_{x}}^{1} {p_{y}}^{0} {p_{z}}^{0}; n = 1, l = 1, m = - 1$

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