Question #678ec

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Question #678ec

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Answer 1 · 2017-03-02T16:10:42

Element number 13 has 1 unpaired electron.

Explanation:

Since $Z = 13$ $Z = 13$ , the electronic configuration of this element, which can be obtained using the principle of Aufbau, is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{1}$ $1s^2 2s^2 2p^6 3s^2 3p^1$ .
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That means that at the last level (the $n = 3$ $n = 3$ level) there will be two paired electrons in the $3 s$ $3s$ orbital and one solitary electron (and, therefore, necessarily unpaired) in one of the $3 p$ $3p$ orbitals (in any of them since all three are degenerate).

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Question #678ec

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