For a zero-order reaction, the half-life period ($t_{1/2}$) is directly proportional to the initial concentration of the reactant ($[R]_0$). The relationship is given by the equation: $t_{1/2} = \frac{[R]_0}{2k}$ . Therefore, if the initial concentration $[R]_0$ is doubled, the half-life period $t_{1/2}$ will also be doubled .