Octet rule hyperconjugation

Thus the use of hyperconjugation preserves the octet rule and does not require the central atom to use d orbitals, which this model s proponents argue are too high in energy to participate in the bonding of these types of molecules. 

Predict the molecular structure of KrF2. Using hyperconjugation, draw the Lewis structures for KrF2 that obey the octet rule. Show all resonance forms. 

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