Sodium is completely filled with K and L shell because its atomic no. is 11.So, we know that K shell contains 2 electrons and L shell contains 8 electrons so 2+8 = 10. And only 1 electron is left in M shell. So, the Valency of Sodium is 1 positive. And we also know that the Valency of atom is the how much electrons it can donate or how much electrons does it need to complete its 1shell.
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