Why the bond angle decreases down the group as the size of the central atom increases in the hydrides of group 16 elements?

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Q. Bond angle of Group-16 hydrides decreases down the group and the bond angle of

H_{2} T e

is approximately

90^{0} .

Why does bond angle in hydrides decrease on going down the group?

Q. Assertion :Acidic character of group 16 hydrides increases from

H_{2} O

H_{2} T e

. Reason: Thermal stability of hydrides decreases down the group.

Q. Assertion :Hydrides of group-16 elements show volatility in the order :

H_{2} O > H_{2} S > H_{2} S e > H_{2} T e

Reason: Electronegativity of group-16 elements increases down the group from oxygen to tellurium.

(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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