The electronic configuration of an element is \( 1 s^{2}, 2 s^{2} \) \( 2 p^{6}, 3 s^{2} 3 p^{3}...

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The electronic configuration of an element is \( 1 s^{2}, 2 s^{2} \) \( 2 p^{6}, 3 s^{2} 3 p^{3} \). What is the atomic number of the element which is just below the above element in the periodic table?
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