site in octahedral holes. What propultu 4.22 Use radius-ratio rules and the ionic radii given in Resou th section...
18. Metallic tungsten adopts a bcc structure with density 19250 kg m? What is the length of the edge of the unit cell? 19. Classify the following material using the electronegativity data and a Ketelaar triangle: (a) V205, (b) LiF, (c) HCI, (d) Cu3Au. 20. Use radius-ratio rules and the ionic radii to predict structures of (a) Na20, (b) HgF2, (c) Mgo, (d) Beo.