Here's how to write the skeleton equation for the reaction of iron and sulfur to produce iron(II) sulfide:

1. Identify the reactants and products:

* Reactants: Iron (Fe) and sulfur (S)

* Product: Iron(II) sulfide (FeS)

2. Write the unbalanced equation:

This is the skeleton equation:

Fe + S → FeS

Explanation:

* The chemical symbols for the elements are used: Fe for iron, S for sulfur, and FeS for iron(II) sulfide.

* The plus sign (+) separates the reactants.

* The arrow (→) indicates the direction of the reaction (from reactants to products).

Note: This is an unbalanced equation. To balance it, you would need to add coefficients in front of the chemical formulas so that the number of atoms of each element is the same on both sides of the equation.