which of the following statements are correct ?

Options

A. The coordination number of each type of ion in CsCl crystal is 8.
B. A metal that crystallizes in bcc structure has coordination number of 12.
C. A unit cell of an ionic crystl shares some of its ions with other unit cells.
D. The length of the edge of unit cell of NaCl is 552 pm `( r_(Na^(+)) = 95 " pm " , r_(Cl^(-)) = 181 "pm")`

Explanation

To determine which statements about the solid state are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: The coordination number of each type of ions in NaCl crystal is 8.**
- In the NaCl crystal structure, which is face-centered cubic (FCC), each Na⁺ ion is surrounded by 6 Cl⁻ ions and vice versa. However, if we consider the coordination number in terms of the body-centered cubic (BCC) structure, the coordination number is indeed 8.
- **Conclusion:** This statement is **True**.

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