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Which of the following best represents the Lewis dot structure for the ionic compound magnesium oxide (MgO)?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Ions
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Which of the following correctly represents the Lewis dot structure for the beryllium ion Be^{2+}?
A
Six dots around Be, representing a filled p orbital.
B
Four dots around Be, representing a full octet.
C
No dots around Be, since it has lost both valence electrons.
D
Two dots around Be, representing its two valence electrons.
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Recall that the Lewis dot structure represents the valence electrons of an atom or ion as dots around the element's symbol.
Determine the number of valence electrons for a neutral beryllium (Be) atom. Beryllium is in group 2, so it has 2 valence electrons.
Consider the charge on the ion Be^{2+}. A 2+ charge means the atom has lost 2 electrons, which are its valence electrons in this case.
Since Be^{2+} has lost both of its valence electrons, it has no valence electrons left to represent as dots in the Lewis structure.
Therefore, the correct Lewis dot structure for Be^{2+} shows no dots around the Be symbol, indicating the absence of valence electrons.
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