What is the name of #Cu_2S#?
Copper sulfide or dicopper sulfide
Copper has two common oxidation numbers + 1 and +2.
Sulfur has a common oxidation number of -2
A more precise name would be Copper I sulfide.
A common name would be Cuprous sulfide. This is an old name for compounds with a +1 charge on Copper. Cupric Sulfide would have the formula
The name is copper(I) sulfide.
Copper is in the
Here are the steps for deriving the name of a compound of a transition metal.
Step 1. Write the name of the transition metal
This gives: "copper".
Step 2. Add the name of the nonmetal with the ending "-ide"
This gives: "copper sulfide".
Step 3. Use the charge on the non-metal to find the charge on the transition metal
The charge on
The total charge on the
Step 4. Write the charge on the non-metal as Roman numerals in parentheses immediately after (no spaces) the name of the metal.
This gives the name: copper(I) sulfide.