Which arrangement is in the correct order of decreasing radii? A)As³ ^ Br ^ K ^ B)F ^  Mg ^ Cs C)Na ^ Cs ^ I ^ D)Be Ba ^ O² ^ E)Li ^ Na ^ K ^

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The arrangement in choice A has the correct order of decreasing radii based on the trend of atomic radii in the periodic table. As you move from left to right across a period, the atomic radius generally decreases, and as you move from top to bottom down a group, the atomic radius generally increases. Choice A follows this trend, with the atoms listed in order from left to right across the period and from top to bottom down the groups.

Which Arrangement Is in the Correct Order of Decreasing Radii