The valency of the element sodium is +1.
This is because it has 11 electrons so its e.conf.=K=2,L=8,M=1
since the last shell has only one electron, it's valency is +1
hope u understood!
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ur welcome :-)
valancy is 1 ............................
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The eletronic configuration of sodium is 2,8,1 means 11 electrons and we know that no of proton is equal to number of electron and sodium can donate only 1 electron and if it does this the number of proton will be 10 and that of electron is 9 .proton is 1 more than electron so it will gain a positive charge of  +1
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