A step-by-step explanation of how to draw the KrF2 Lewis Dot Structure (Krypton Difluoride).
For the KrF2 structure use the periodic table to find the total number of valence electrons for the KrF2 molecule. Once we know how many valence electrons there are in KrF2 we can distribute them around the central atom with the goal of filling the outer shells of each atom.
Because Krypton is below Period (row) Two on the periodic table it can hold more than eight valence electrons (termed an "expanded octet"). So in the Lewis structure for KrF2 its okay that we have 10 valence electrons around the Krypton atom.
In the Lewis structure of KrF2 structure there are a total of 22 valence electrons. KrF2 is also called Krypton Difluoride.
Note that KrF2 can have an Expanded Octet and have more than eight valence electrons. Because of this there may be several possible Lewis Structures. To arrive at the most favorable Lewis Structure we need to consider formal charges. See how to calculate formal charges:
https://www.youtube.com/watch?v=vOFAPlq4y_k----- Steps to Write Lewis Structure for compounds like KrF2 ------
1. Find the total valence electrons for the KrF2 molecule.
2. Put the least electronegative atom in the center. Note: Hydrogen (H) always goes outside.
3. Put two electrons between atoms to form a chemical bond.
4. Complete octets on outside atoms.
5. If central atom does not have an octet, move electrons from outer atoms to form double or triple bonds.
----- Lewis Resources -----
• Lewis Structures Made Simple:
https://youtu.be/1ZlnzyHahvo• More practice:
https://youtu.be/DQclmBeIKTc• Counting Valence Electrons:
https://youtu.be/VBp7mKdcrDk• Calculating Formal Charge:
https://youtu.be/vOFAPlq4y_k• Exceptions to the Octet Rule:
https://youtu.be/Dkj-SMBLQzMLewis Structures, also called Electron Dot Structures, are important to learn because they help us understand how atoms and electrons are arranged in a molecule, such as Krypton Difluoride. This can help us determine the molecular geometry, how the molecule might react with other molecules, and some of the physical properties of the molecule (like boiling point and surface tension).
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