Answer:
A
Step-by-step explanation:
Hello,
Binary ionic compounds are those compounds that consist of two elements and usually one has a positive ion while the other one carries a negative ion and they both combine together to form a compound.
In the options above, option A is the right answer because it has a combination of positive ions.
For ionic compounds to form, a strong electropositive element must combine with a strong electronegative element.
Most metals are usually electropositive and carry a positive ion and non metals tends to carry negative ions.
Br = non metal = negative ion
Ca = metal = positive ion
Na = metal = positive ion
N = non metal = negative ion
F = non metal = negative ion
Al = metal = positive ion
Sn = metal = positive ions
S = non metal = negative ion
Cd = metal = positive ion
Option A has a combination of all the positive ions here.