1. Tardigrade
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  4. In any period, the valency of an element with respect to oxygen

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Q. In any period, the valency of an element with respect to oxygen

Classification of Elements and Periodicity in Properties

Solution:

Since oxygen is more electronegative element so it will form oxide with elements of group IA to VIIA in their maximum oxidation state. Maximum oxidation state is equal to number of valence electron in outermost shell . Hence it increases by one in any period.