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Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å . The radius of sodium atom is approximately:

Options

  1. A0.93 Å
  2. B1.86 Å
  3. C3.22 Å
  4. D5.72 Å

Correct answer

B. 1.86 Å

Step-by-step solution

For B.C.C lattice, 4 r = 3 a where 'r' is radius of atom and 'a' is edge length of unit cell r = 3 4 a = 1.732 4 × 4.29 = 1.86 Å

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