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Of the following elements, has the most negative (largest) electron affinity. Se 5 1 Cl Br Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+H2O(I)Ca(OH)2(s) A 3.00-g sample of CaO is reacted with 2.90g of H2O. How many grams of water remain after completion of reaction? 0.00595 0.1072 1.04 Which orbital-filling diagram violates Hund's rule? [Ar] 4s3d [Ar]4s3d [Ar]4s3d