(D) Valency is defined as the combining capacity of an element. Noble gases,such as $Kr$ (Krypton),have a completely filled valence shell ($ns^2 np^6$

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(D) Valency is defined as the combining capacity of an element. Noble gases,such as $Kr$ (Krypton),have a completely filled valence shell ($ns^2 np^6$ configuration). Due to their stable electronic configuration,they have very little tendency to gain,lose,or share electrons,resulting in a valency of zero.