Question

Question #15936

Answer 1

`XY_2`

Explanation:

e.g. `MgCl_2`, `BaBr_2`

Atom X requires two electrons to fill its valence shell
Atom Y requires one electron to fill its valence shell

Therefore, atom X forms two bonds with two Y atoms.

See an example below, with the dot and cross diagram to show the ionic bonding:

![http://slideplayer.com/slide/8070798/]()