Understanding the Concept

* Binary Ionic Compounds: These compounds consist of a metal cation (positively charged ion) and a nonmetal anion (negatively charged ion).

* 10 Electrons: Atoms with 10 electrons are isoelectronic with the noble gas neon (Ne). This means they have the same electron configuration as neon.

Finding the Elements

1. Cation: To have 10 electrons, the cation must have lost electrons. This means it must be a metal that originally had more than 10 electrons. Look for elements in groups 1, 2, or 3 on the periodic table.

* Sodium (Na): Sodium has 11 electrons and loses one to become Na+ with 10 electrons.

* Magnesium (Mg): Magnesium has 12 electrons and loses two to become Mg2+ with 10 electrons.

* Aluminum (Al): Aluminum has 13 electrons and loses three to become Al3+ with 10 electrons.

2. Anion: To have 10 electrons, the anion must have gained electrons. This means it must be a nonmetal that originally had fewer than 10 electrons. Look for elements in groups 16 or 17 on the periodic table.

* Oxygen (O): Oxygen has 8 electrons and gains two to become O2- with 10 electrons.

* Fluorine (F): Fluorine has 9 electrons and gains one to become F- with 10 electrons.

Possible Compounds

Based on the above, we can form several possible binary ionic compounds:

* Na2O (Sodium Oxide)

* MgO (Magnesium Oxide)

* Al2O3 (Aluminum Oxide)

* NaF (Sodium Fluoride)

* MgF2 (Magnesium Fluoride)

* AlF3 (Aluminum Fluoride)

Note: There could be other possibilities if we consider less common ions, but these are the most likely scenarios.