Protons and electrons are represented by the symbols ${\mathrm{p}}^0$ and ${\mathrm{e}}^{+}$ respectively.

The abbreviation used to denote an element chemically _____.

The scientist who discovered neutron is _____.

(Chromatograph, Valency, Cuprum, Negatively, ${\mathrm{ZnCl}}_2$, one, $\mathrm{ZnS}$, Positively, Separating funnel)

Millikan's method is used for the determination of _____ of an electron.

$$\begin{gathered} \mathrm{A}: 1.602\mathrm{x}{10}^{-29} \mathrm{C} \\ \mathrm{B}: -1.602\times {10}^{-19} \mathrm{C} \\ \mathrm{C}: 1.602\mathrm{x}{10}^{-19} \mathrm{C} \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)