i) Atomic radius increases down a group and decreases across a period. Element F is in Group 1, Period 3. Elements H and I are in Period 4. While elements in Period 4 are generally larger than those i
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10. a)
i) Atomic radius increases down a group and decreases across a period. Element F is in Group 1, Period 3. Elements H and I are in Period 4. While elements in Period 4 are generally larger than those in Period 3, Group 1 elements have significantly larger atomic radii than elements in later groups, even if the latter are in a lower period. Comparing F (Group 1, Period 3) with H (Group 13, Period 4), F is larger.
The element with the largest atomic radius is F.
ii) Reactivity of non-metals increases across a period and decreases down a group. The most reactive non-metals are halogens (Group 17). Element K is in Group
