Select the single best Lewis electron-dot symbol for the ion formed from Br: Br3 Br2 Br Br

To determine the correct Lewis electron-dot symbol for the ion formed from bromine (Br), we need to consider the most common ion that bromine forms and how to represent it with a Lewis dot structure.

Explanation

1. Identification of Ion: Bromine typically forms an anion by gaining one electron to achieve a stable electron configuration. Therefore, the most common ion of bromine is bromide, represented as $\text{Br}^-$.

2. Determining Electrons: Bromine has 7 valence electrons in its neutral state. When it gains one electron to form the bromide ion, it has a total of 8 valence electrons.

3. Drawing the Lewis Dot Structure:

   • A bromine atom has 7 dots representing its valence electrons.
   • When it gains one electron to form $\text{Br}^-$, it will have 8 dots surrounding it.

Final Answer

The correct Lewis electron-dot symbol for the ion formed from Br is $\text{Br}^-$ and it is represented as follows:

$\text{Br}:\ \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

This representation shows 8 dots, indicating full valence shell, characteristic of the bromide ion. So, the answer choice would be the one that illustrates this configuration.