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A solid AB has NaCl type structure with edge length 580 . 4 p m . The radius of A + is 100 p m . What is the radius of B - in pm?

Options

  1. A190 . 2
  2. B540 . 13
  3. C525
  4. D78 . 12

Correct answer

A. 190 . 2

Step-by-step solution

N a C l has fcc structure and thus, r c + r a = a 2 100 + r a = 580 . 4 2 = 290 . 2 100 + r a = 290 . 2 So r a = 290 . 2 - 100 = 190 . 2 p m

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