As the atomic number of Group IA elements increases, does the reactivity of the elements increase or decrease? Suggest a reason for this trend based on the ionization energy simulation on the table. That is, what causes the reactivities to follow this order? Combination Initial Top Layer Color Final Top Layer Color Initial Halogen Final Halogen Reaction? (Yes or No) Cl2 + NaBr Clear yellowish orange Cl2 NaBr yes Cl2 + NaI Clear purple Cl2 NaI yes Br2 + NaCI Yellowish Orange yellowish orange Br2 Br2 no Br2 + NaI yellowish orange purple Br2 NaI yes I2 + NaCl purple purple I2 I2 no I2 + NaI purple purple I2 I2 no

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