Classify the following materials using the electronegativity data in Table 1.7 (see the textbook and consider Pauling's values) and a Ketelaar triangle. Lii BeBr2 TII Consider the below unit cell. How many formula units (Z) present in the unit cell? [Answer] Classify the following materials using the electronegativity data in Table 1.7 (see the textbook and consider Pauling's values) and a Ketelaar triangle. Lii BeBr2 TII Consider the below unit cell. How many formula units (Z) present in the unit cell? [Answer]