if a metal has a bcc crystal structure, the coordination number is 8,because `:`

Options

A. each atom touches four atoms in the layer above it, four in the layer below it and none in its own layer.
B. each atom touches four atoms in the layer above it, four in the layer below it and one in its own layer.
C. two atoms touch four atoms in the layer above them, four in the layer below them, and none in their own layer.
D. each atom touches eight atoms in the layer above it, eight in the layer below it and none in its own layer.

Explanation

To determine why a metal with a body-centered cubic (BCC) crystal structure has a coordination number of 8, we can follow these steps:

### Step-by-Step Solution:

1. **Understand BCC Structure**:
- The body-centered cubic (BCC) structure consists of atoms located at each of the eight corners of a cube and one atom at the center of the cube.

2. **Identify the Central Atom**:
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