Write Lewis dot symbols for atoms of the following elements: `Mg`,`Na`,`B`,`O`,`N`,`Br`.

Explanation

To write the Lewis dot symbols for the atoms of the elements magnesium (Mg), sodium (Na), boron (B), oxygen (O), nitrogen (N), and bromine (Br), we will follow these steps:

### Step 1: Determine the number of valence electrons for each element.
- **Magnesium (Mg)**: Atomic number = 12. Electronic configuration = 1s² 2s² 2p⁶ 3s². Valence electrons = 2.
- **Sodium (Na)**: Atomic number = 11. Electronic configuration = 1s² 2s² 2p⁶ 3s¹. Valence electrons = 1.
- **Boron (B)**: Atomic number = 5. Electronic configuration = 1s² 2s² 2p¹. Valence electrons = 3.
- **Oxygen (O)**: Atomic number = 8. Electronic configuration = 1s² 2s² 2p⁴. Valence electrons = 6.
- **Nitrogen (N)**: Atomic number = 7. Electronic configuration = 1s² 2s² 2p³. Valence electrons = 5.
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