What is the name of #As_2S_3#?
This is arsenic trisulfide, a bright yellow solid insoluble in water.
The name is diarsenic trisulfide.
The rules for naming the compound are:
1. Write the names of the elements in the same order as in the compound.
This gives the name arsenic sulfur.
2. Replace the name of the second element with its root followed by the suffix -ide.
The root of
This gives the name arsenic sulfide.
3 Indicate the numbers of each atom by a multiplying prefix
The multiplying prefix for two is
Thus, the name of