The elements in the periodic table that can form an ionic compound with a metal M and a nonmetal X with a formula unit of M3X2 are elements of group 2 and group 15.
The elements of group 2 are metals that have a valency of 2 while the elements of group 15 are nonmetals that have a valency of 3. This means that a compound formed between elements of group 2 and group 15 will be ionic with the formula unit M3X2.
The elements of group 2 are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra) while the elements of group 15 are nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb) and bismuth (Bi).
These elements listed above can combine with each other to form ionic compounds of formula unit M3X2. A typical example of this is Mg3N2.
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