The mineral clausthalite is composed of lead selenide (PbSe). This mineral adopts the NaCl structure - the anions are arranged in face-centered cubic structure. Fill in the needed information below and explain why: The number of ions within the unit cell occupying the faces is:

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Crystallography

Crystallography is the category of science that focuses on the atomic and molecular arrangements with their bonding constituting the crystal structure. It is derived experimentally and originated in the year 1912. It is a combination of two words; those are crystal, meaning a cold drop, and graph, meaning writing.