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Question

The valency of noble gases is generally:

A
zero
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B
one
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C
three
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D
two
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Solution

The correct option is A zero
Valency of an element is defined as its tendency to accept valence electrons.
Since noble gas has completely filled valence (outer) shell, they have the least reactivity.
Hence noble gases are already stable in its elemental form. So its valency is zero.

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