Answer
$M_{2}S$
$M_{3}N_{2}$
$AlX_{3}$
Work Step by Step
When metals react with non-metals the ionic compounds are formed through transfer of electrons from metals to non-metals.
When alkali metals combine with sulphur the resultant compounds are called sulphides with a general formula $M_{2}S$.
When alkaline earth metals react with nitrogen, metal nitrides are formed with a general formula $M_{3}N_{2}$.
The compounds formed between Al and halogens are known as Al halides with general formula $AlX_{3}$.
