Answer and explanation:
To draw the Lewis Dot Diagram, we can get help from the periodic table. You can see that the number of valence electrons of the given elements can be easily seen in the family groups (the columns of the periodic table).
- Magnesium: You can see that magnesium (Mg) is in the IIA family of the periodic table, so it has 2 valence electrons:
- Oxygen: Oxygen (O) is in the VIA family of the periodic table, so O has 6 valence electrons:
- Nitrogen: This element (N) is in the VA group of the periodic table, so it has 5 valence electrons:
- Fluorine: This element (F), you can see that is located in the VIIA group of the periodic table: