Question

why does not sodium react with water in blood

Answer 1

Answer:

There is a single electron in that shell. ... This is why sodium reacts so vigorously with water: it's getting rid of that outermost electron and turning into sodium ions in the process: But sodium ions don't have that outermost electron, so they don't have any reason to react with water.

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Answer 2

Answer:

There is a single electron in that shell. That electron is weakly bound, and would very much like to be somewhere else. ... But sodium ions don't have that outermost electron, so they don't have any reason to react with water. This is also why sodium chloride, AKA table salt, is not reactive.