Here's why:
* Binary compounds are compounds made of only two elements.
* Metal ions are positively charged ions formed when a metal atom loses electrons.
* Nonmetal anions are negatively charged ions formed when a nonmetal atom gains electrons.
For example:
* Sodium chloride (NaCl) is a binary compound formed by the metal ion sodium (Na+) and the nonmetal anion chloride (Cl-).
* Magnesium oxide (MgO) is another binary compound formed by the metal ion magnesium (Mg2+) and the nonmetal anion oxide (O2-).
In general, the nonmetal anion in a binary compound with a metal ion will have a name ending in "-ide". For example:
* Fluoride (F-)
* Chloride (Cl-)
* Bromide (Br-)
* Iodide (I-)
* Oxide (O2-)
* Sulfide (S2-)
* Nitride (N3-)
* Phosphide (P3-)
Let me know if you'd like more examples!
