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Question
Which of the following elements has a zero valency?
Which of the following elements has a zero valency?
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Solution
The correct option is B He
Atomic number of He is 10 and its electronic configuration is 2,8.
Since it has completely filled valence shell, it does not gain or lose any electron.
Valency of He is zero as it has a stable noble gas configuration and thus, it does not involve in bond formation.
Hence the correct option is B.
Atomic number of He is 10 and its electronic configuration is 2,8.
Since it has completely filled valence shell, it does not gain or lose any electron.
Valency of He is zero as it has a stable noble gas configuration and thus, it does not involve in bond formation.
Hence the correct option is B.
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