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.
The formula for iron iodide is FeI2. It consists of one iron (Fe) atom and two iodine (I) atoms.
When sodium atoms react with iodine atoms, they undergo a redox reaction to form sodium iodide. Sodium atoms lose an electron to form Na+ ions, while iodine atoms gain an electron to form I- ions. These ions then combine to form sodium iodide crystals.
Strontium and iodine would form ionic bonds in a compound with formula SrI2.