Final answer:
The charge on monatomic ions is usually determined by an element's group number in the periodic table. Iodine forms a -1 charge, strontium forms a +2 charge, potassium forms a +1 charge, nitrogen forms a -3 charge, sulfur forms a -2 charge, and indium typically forms a +3 charge.
Step-by-step explanation:
When predicting the charge on monatomic ions of various atoms in binary ionic compounds, one must consider their position on the periodic table. The periodic table is an essential tool for predicting likely ion formation and charge.
- For iodine (I), being a halogen in group 17, it will typically form an anion with a charge of -1.
- Strontium (Sr), being in group 2, will form a cation with a charge of +2.
- Potassium (K), a group 1 element, will form a cation with a charge of +1.
- Nitrogen (N), located in group 15, will form an anion with a charge of -3.
- Sulfur (S), a group 16 element, will form an anion with a charge of -2.
- Finally, indium (In), although not always predictable due to being a post-transition metal, typically forms a cation with a charge of +3, as it is in group 13.
It's important to note that while the group number can often predict the charge for main-group elements, transition metals and some other metals might exhibit variable charges that are not predictable solely based on their location in the periodic table.