The correct name for the compound SrI2 is strontium diiodide.
To understand why, let’s break down the components of the name:
- Strontium: This refers to the strontium ion (Sr2+), which has a +2 charge.
- Diiodide: The prefix ‘di-‘ indicates that there are two iodine atoms. The iodide ion (I–) carries a -1 charge.
Since there are two iodide ions needed to balance the +2 charge of one strontium ion, the formula ends up being SrI2. Therefore, the correct naming convention uses ‘di-‘ to indicate the presence of two iodine atoms, leading us to the name strontium diiodide.