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Question

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Why do helium, neon, and argon have a zero valency?

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Solution

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Since they have a stable electronic configuration, they neither lose electrons nor gain electrons.
Hence, their valency is zero. [1 Mark]

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