how do you know whether the product is a solid, liquid, or gas at room temperature? What is the balanced chemical equation for the reaction? Regarding when the metallic element sodium combines with...

how do you know whether the product is a solid, liquid, or gas at room temperature? What is the balanced chemical equation for the reaction? Regarding when the metallic element sodium combines with the non metallic element iodine, I2(s).

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The chemical equation for sodium reacting with iodine is:

2Na + I2 --> 2NaI

Solid metallic sodium combines with solid iodine to produce solid sodium iodide.  Sodium is a group 1 metal and as such it readily loses an electron to become the highly stable sodium cation (Na+).  Iodine is a halogen and as such it readily gains an electron to become the highly stable iodide anion (I-).  The sodium cation and the iodide anion combine to form sodium iodide (NaI).  We know that this is a solid at room temperature since it is an ionic salt and as such has an extremely high melting point.  It is also highly soluble in water.

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