For each of the following reactions identify the products formed and balance the reaction.

$\mathrm{Zn}+\mathrm{HCl}\to$

In an atom of an element, $\mathrm{K}$ and $\mathrm{N}$ shells have the same number of electrons. The number of electrons in $\mathrm{L}$ and $\mathrm{M}$ shells is also the same. Determine the formula of the compound formed by this element and fluorine.