3; 1 calcium and 2 iodine
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Calcium iodide (CaI2) has two iodine atoms and one calcium atom.
Iodide is the I- ion, so it contains no oxygen atoms at all. Perhaps you meant iodate. It has 3 oxygen atoms per iodine atom: (IO3)-.
Copper iodide has one copper atom and one iodide atom in its chemical formula, which is CuI.
Calcium iodide has a total of 3 atoms: 1 calcium atom and 2 iodine atoms.
In one molecule of silver iodide (AgI), there is one silver atom and one iodine atom, totaling two atoms.
Aluminum iodide has a formula AlI3, which means it contains 1 aluminum atom and 3 iodine atoms. Therefore, one molecule of aluminum iodide contains 4 atoms in total.
Sodium iodide is composed of sodium (Na) atoms and iodine (I) atoms. Sodium contributes the positive charge, while iodine provides the negative charge.
There is one atom of potassium in a unit of potassium iodide.
PBI2, or lead(II) iodide, consists of one lead (Pb) atom and two iodine (I) atoms. Therefore, there are a total of three atoms in one formula unit of PBI2.
Sodium iodide (NaI) consists of sodium (Na) and iodine (I) atoms. Sodium has 1 valence electron, while iodine has 7 valence electrons. Therefore, in total, sodium iodide has 1 + 7 = 8 valence electrons.
The formula for iron iodide is FeI2. It consists of one iron (Fe) atom and two iodine (I) atoms.