KCL formula means

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I could not clearly understand and interpret your query.
KCl is the formula for potassium chloride. Here, potassium metal loses one electron of its valence shell and chlorine atom gains this electron in order to complete their octets. Hence, an ionic molecule of potassium chloride is formed. 

$$\begin{gathered} K \to K^{+} + e^{-} \\ Cl + e^{-} \to C{l}^{-} \\ The resul\tan t is K^{+} + C{l}^{-} \to KCl \end{gathered}$$

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Akanksha Jain