Al2S3 is the correct formula for aluminum sulfide.
Al2(CO3)3
AlF3
Yes. However, the correct formula is Na2SO4.
CaF2
Apparently this compound is not ionic in structure. The attached link refers to "cubic lattice containing two molecules of Mg3As2 in the unit cell."
Na2s
K2s
the correct formula unit for the ionic compound barium oxide is BaO.
Yes. However, the correct formula is Na2SO4.
CaF2
More correct KCl is the formula unit of potassium chloride.
ionic bonding
Apparently this compound is not ionic in structure. The attached link refers to "cubic lattice containing two molecules of Mg3As2 in the unit cell."
Na2s
K2s
The formula is not ionic or covalent, the compound itself is.
The correct formula is K2Se. It is an ionic compound: potassium selenide.
Ca(ClO3)2.
aluminum cloride