To determine the appropriate suffix for the given compounds, let’s take a close look at each one:
1. [tex]\( FeS \)[/tex]
- This compound is known as Iron(II) sulfide.
2. [tex]\( NaCl \)[/tex]
- This compound is known as Sodium chloride.
3. [tex]\( Al_2O_3 \)[/tex]
- This compound is known as Aluminum oxide.
By examining the names of these compounds:
1. Iron(II) sulfide ends with the suffix “-ide”.
2. Sodium chloride ends with the suffix “-ide”.
3. Aluminum oxide ends with the suffix “-ide”.
From this, we can see that all the compound names end with the suffix “-ide”.
Therefore, the best answer for the question is:
A. -ide
