Na and Cl: Most Common Ions in Ocean Water

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Homework Statement


Why are Na and Cl the two most common ions?

Why doesn't the ocean's salinity change

The Attempt at a Solution



I would guess that they're the most abundant ions simply because there occur more often in nature than the other elements in sea water.

As for the second part, I'd guess that rivers, precipitation along with evaporation, and minerals being eroded into the ocean tend to cancel one another out.
 
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Most likely because they are most stable ions. Not all ions are stable just because they have octet. Don't take my answer to seriously xD

2nd part: no idea