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Which of the following is the best Lewis dot symbol for bromine (Br)?
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11. Bonding & Molecular Structure
Lewis Dot Symbols
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Which of the following best represents the Lewis dot structure of the Mg^{2+} ion?
A
Mg^{2+} with two dots
B
Mg^{2+} with six dots
C
Mg^{2+} with no dots
D
Mg^{2+} with eight dots
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Recall that Lewis dot structures represent the valence electrons of an atom or ion as dots around the element's symbol.
Magnesium (Mg) is in group 2 of the periodic table, so it has 2 valence electrons in its neutral state.
When Mg forms a Mg^{2+} ion, it loses 2 electrons to achieve a stable electron configuration similar to the nearest noble gas (Neon).
Since Mg^{2+} has lost its 2 valence electrons, it no longer has any valence electrons to represent as dots in the Lewis structure.
Therefore, the Lewis dot structure of Mg^{2+} should show the symbol Mg^{2+} with no dots around it.
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