Which of the following set of quantum numbers correctly represents Beryllium's fourth electron?
$n l m s$

100 - \frac{1}{2}

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111 + \frac{1}{2}

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200 - \frac{1}{2}

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210 + \frac{1}{2}

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Solution

The correct option is C $200 - \frac{1}{2}$
Electronic config for Be is ${1 s}^{2} {2 s}^{2}$ . Fourth electron is in s orbital so $n = 2, l = 0, m = 0$ and $s = - 1 / 2$

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Similar questions

Which one of the following represents a wrong set of quantum numbers for an electron in an atom? (arranged as n, l, m, and s)

+ 1 / 2

- 1 / 2

+ \frac{1}{2}

- \frac{1}{2}

+ \frac{1}{2}

- \frac{1}{2}

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