Question

what is coordination number? find the coordination number in Nacl and Cscl​

Answer 1

HELLO!

Coordination number of the central atom is basically the number of atoms surrounding it.

CsCl is a BCC type arrangement, where each Cs⁺ atom is in contact with 8 Cl⁻ ions, hence the coordination number in CsCl is 8.

In NaCl, each Na⁺ occupies the octahedral voids, and 6 Na⁺ ions surround one Cl⁻ ion, so coordination number in NaCl is 6.

Thanks!

Answer 2

Answer:

CsCl and NaCl do not adopt identical crystal packing arrangements because the Cs + ion is considerably larger than the Na + ion. In a cesium chloride crystal, the cesium ion (orange) occupies the center, while the chloride ions (green) occupy each corner of the cube. The coordination number for both ions is 8.