Question

Assertion (A) Each simple cubic unit cell has $8$ atoms.
Reason (R) The total number of atoms in one cubic unit cell is $1$ .

• A. Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$.
• C. $A$ is correct; $R$ is incorrect.
• D. $R$ is correct; $A$ is incorrect.

Answer 1

Answer: (A)

Each cubic unit cell has $8$ atom $(s)$ at its corners. Since, each corner atom is shared by $8$ unit cells, so total number of atom in one unit cell is $8\times \frac{1}{8}=1$ atom.