The number of Cl- ions per unit cell of a simple cubic lattice at the corner is/are:

Explanation

- In a simple cubic lattice, each corner is shared by eight adjacent unit cells.- Each corner atom/ion contributes (1/8) to the unit cell it is a part of.- For Cl- ions in a simple cubic lattice, considering their distribution, each Cl- ion is shared equally among eight neighboring unit cells. Hence, only (1/8) of a Cl- ion is present per unit cell at each corner.- Since each corner contributes (1/8) of a Cl- ion and there is one corner in a unit cell, the total contribution of Cl- ions from corners to a single unit cell is (1 times 1/8 = 1/8), which is approximately 1. Therefore, option a is correct.