3; 1 calcium and 2 iodine
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The most common compound containing one calcium atom for every two iodine atoms is simply CaI2, or Calcium Iodide.
Calcium Iodide
I believe you mean the formation of the compound calcium iodide. In the formation of calcium iodide, CaI2, the calcium atom transfers two valence electrons to two iodine atoms, with one electron going to each iodine atom. This causes the formation of a calcium ion, Ca2+, and two iodide ions, I-. The electrostatic attraction between the oppositely charged ions forms the ionic bonds that form the compound calcium iodide.
The formula unit for calcium nitride is Ca3N2. That would be 3 atoms of calcium and 2 atoms of nitrogen, for a total of 5 atoms in a formula unit.
The answer is 28,0987.1023 atoms.
Calcium iodide (CaI2) has two iodine atoms and one calcium atom.
3; 1 calcium and 2 iodine
The formula for calcium iodide is CaI2. This means that the calcium atom has transferred one electron to each of two iodine atoms, for a total of two electrons transferred.
The elements in calcium iodide are calcium and iodine.
Calcium iodide.
This compound is the calcium iodide - CaI2.
The calcium atom will transfer its two valence electrons, one to each of two iodine atoms, to form the compound calcium iodide, CaI2.
As an element iodine is 'I2' and calcium is 'Ca'. However, in combination it CaI2 ( Calcium Iodide.
It takes only one valence electron to form the calcium iodide compound.
The most common compound containing one calcium atom for every two iodine atoms is simply CaI2, or Calcium Iodide.
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CaC2 is Calcium Carbide. Ca2C does not exist.