why sodium has valency 1?
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Because it has 1 electron in its outer most shell.
priyanka95:
and why sodium has only one valence electron? :/
Because its atomic no. is 11. Therefore its electronic configuration will be 11 = 2,8,1.
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Because it's atomic number is 11
Therefore it's configuration is 1s^2 2s^2 2p^6 3s^1
Since it's "3s¹" that means one valence electron.
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