Give the symbol of the elements of lowest atomic number that has three \( 2 p \) electrons: (a) ...

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Give the symbol of the elements of lowest atomic number that has three \( 2 p \) electrons:
(a) \( \mathrm{Mg} \)
(b) \( \mathrm{P} \)
(c) \( \mathrm{N} \)
(d) \( \mathrm{Si} \)
\( P \)
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