Quantum Model of Bonding Electrons in Crystal

the crystalline potential satisfies the periodicity relation  

However, what can there be said about the eigen-function associated by general Schrodinger equation (Putz, 2006) 

Quantum Nanochemistry—Volume IV Quantum Solids and Orderability 

FIGURE 3.21 Model or periodical well in a Kionig-Penney crystal potential model after Putz (2006). 

Directly, without solving the Eq. (3.79), there can be said only that the associated density of probability according to the quantum mechanical postulate [P2], since associated with localization electrons in crystalline field, it should keep the same periodicity, so generating the 

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