Question

NaCl and CsCl has similar formula. then why they have different structures?​

Answer 1

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The radius ratio of NaCl (rNa+/rCl-) lies in the range 0.414 -0.732. ... Hence , it has a coordination number of 6, i.e., octahedral arrangement . On the other hand, the radius ratio of CsCl (rCs+/rCl-) lies in the range 0.732-1.0 .

Answer 2

Answer:

The radius ratio of NaCl (rNa+/rCr−) lies in the range 0.414 - 0.732 . Hence, is has coordination number of 6. i.e.c octahedral arrangement. On the other hand, the radius ratio of CsCl (rcs+/rcl− lies in the ranhge 0.732 -1 .0 Hence, it has a coordination number of 8. i,e. it has a body -centred cubic arrangement.