Answer:
NaI
Explanation:
The formula for sodium iodide is NaI
It is a compound (ionic compound) formed by the chemical reaction between sodium, Na and iodine.
The sodium is a metal in group 1 with atomic number 11 and mass number 23 ,it has one valence electron which it gives out to form a cation of +1 charge and the iodine is in group 7(halogen family) with atomic number 57 and mass number 23 and it has 7 valence electrons which allows it attract 1 electron to form an anion(iodide) of charge -1.
The reaction of sodium ion with iodide ion form the sodium iodide where sodium releases its one valence electron and iodine receives it which makes it balance that is they react in ratio 1:1 and thus have a chemical formula of NaI.
NaI has atomic mass of 150g/mole that is 127 + 23 = 150
Where
Na=23g/mol, I = 127g/mol
NaI is used mainly as nutritional supplement
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