correct, the sodium and chlorine have already reacted with each other and the sodium has lost an electron to the chlorine. Both now have electron structures like a noble gas nd as such are unreactive.
A "reaction" can be measured however adding salt to water will (i think) cool it (i cant remember off the top of my head) this is because enery is needed to break the rystals of salt down. THis energy comes from the water.
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