What elements make up ionic compounds?
Typically the ions of metals, and non-metals.........
Metals are electron-rich species that tend to be reducing, and thus typically form
Non-metals species are typically found on the the righthand side of the Periodic Table as we face it; their (enhanced) nuclear charge tends to make them oxidizing:
Given the appropriate stoichiometry, a redox process (i.e. electronic transfer) can result in salt formation: