The compound, (nh4) 2s, can be used in analysis for trace amounts of metals present in a sample. what is its name?

To name compounds, usually, they are a combination of a metal and a nonmetal, between nonmetals and between metals. The two elements here are ammonium (NH₄) and sulfur (S). These are both nonmetals. When you name the compound, start by ammonium, followed by sulfur plus a suffix of - ide. The compound is ammonium sulfide.