Na and Mg crystallize in BCC and FCC types of crystals respectively. What will be the number of atoms of Na and Mg present in the unit cell of their respective crystal?
To determine the number of atoms present in the unit cells of Na and Mg, which crystallize in BCC (Body-Centered Cubic) and FCC (Face-Centered Cubic) structures respectively, we can analyze the characteristics of these crystal structures:
Body-Centered Cubic (BCC) Structure:
In a BCC structure:
There is one atom at each of the eight corners of the cube.
There is one atom at the center of the cube.
The contribution of the atoms at the corners to the unit cell:
Each corner atom is shared among eight neighboring unit cells. In summary:
Sodium (Na) has 2 atoms per unit cell in its BCC structure.
Magnesium (Mg) has 4 atoms per unit cell in its FCC structure.
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