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The electronegativity values on the Pauling scale are C (Carbon) = 2.55, P (Phosphorus) = 2.19, Br (Bromine) = 2.96, and At (Astatine) ≈ 2.2.
Since electronegativity increases from left to right across a period and from bottom to top in a group, the elements can be ranked by comparing these values.
Ordering from highest to lowest gives $$ Br (2.96) > C (2.55) > At (2.2) > P (2.19) $$. Therefore, the correct order is Br > C > At > P.
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