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Na and Zn are correct because they are elements. Na is monovalent so NaI is correct. Zn is divalent and so ZnI is incorrect and should be ZnI2 .
So if we have ZnI2 we need 2 Na to remove the I2 . So balanced it becomes:
2Na + ZnI2 ----> 2NaI + Zn
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Your question leads me to believe that you have the following equation: Na + Cl ---> NaCl2 In that case, note there is one Na (sodium) on the left and one on the right, so they are good. There's one chloride on the left but two on the right, so placing a "2" in FRONT of the Cl on the left will balance the equation and look as such: Na + 2Cl ---> NaCl2
