Final answer:
Chlorine (Cl) is an element with a fixed charge of -1 in an ionic compound. It belongs to group 17, the halogens, which generally form ions with a -1 charge by gaining one electron to achieve a full outer shell.
Step-by-step explanation:
The element that would have a fixed charge of -1 in an ionic compound is chlorine (Cl). When atoms form ions, they gain or lose electrons to achieve a full outer shell, similar to the nearest noble gas. Elements from group 17 of the periodic table, known as halogens, such as chlorine, fluorine, and bromine, commonly gain one electron to form an ion with a -1 charge.
Other examples include:
- Calcium (Ca) typically forms a Ca2+ ion.
- Iodine (I) forms a I- ion.
- Iron (Fe) can form Fe2+ or Fe3+ ions depending on the conditions.
- Sulfur (S) typically forms a S2- ion.
- Sodium (Na) forms a Na+ ion.
- Hydrogen (H) can form a H+ ion (proton) or a H- ion when it gains an electron.