Sodium oxide (na2o) crystallizes in a structure in which the o2– ions are in a face-centered cubic lattice and the na+ ions are in tetrahedral holes. The number of na+ ions in the unit cell is:.

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Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.

Logistic growth curves are density-dependent. select the best answer from the choices provided t f