Question

(KBr crystallizes in NaCl type of unit cell. K: radius = 1.338, Br" radius = 1.95 Å (a) How many Kions and how many Br ions are in each unit cell? (b) Assuming the additivity of ionic radii, what is a ? (c) Calculate the density of a perfect KBr crystal. (d) What minimum value of r/r- is needed to prevent anion-anion contact in this structure.​

Answer 1

Answer:

Pythagoras held that the soul was of divine origin and existed before and after death. Plato and Socrates also accepted the immortality of the soul, while Aristotle considered only part of the soul, the noûs, or intellect, to have that quality.

Answer 2

Answer:

(a) K+ ion = 4 & Br− ion = 4 (b) 6.56Å (c) 2.80g/cm3 (d) 0.414

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