Why does acidic character increases down the group in case of reaction of group 15 elements with hydrogen and decreases down the group in case of reaction of group 15 with oxygen? Kindly explain.

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Q. Why the reducing character of trihydrides of group

15

elements increases down the group?

Q. Why acidic character of oxides decrease down the group?

(i) Electropositive nature of the element(s) increases down the group and decreases across the period
(ii) Electronegativity of the element decreases down the group and increases across the period
(iii) Atomic size increases down the group and decreases across a period (left to right)
(iv) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Which is the element with the smallest atomic size

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