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The di-positive and di-negative ions of ...

The di-positive and di-negative ions of different elements possesses octet configuration in their third shell. Find out the atomic number and number of valence electrons in their neutral atoms .

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Electronic configurations of dipositive and dinegative ions are 2, 8, 8 if they contain an octet configuration in their third shell. Electronic configurations of neutral atom of dipositive and dinegative ions are 2, 8, 8, 2 and 2, 8, 6. Two and 6 are the valence electrons present in the neutral atoms, respectively and atomic numbers are 20 and 16, respectively.
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