Gabriel, Ashley, and Atticus are participating in a science competition where they need to arrange nonmetals based on their reoctivity .Since the activity or reactivity.of nonmetals depends on the ease with which their otoms gain electrons, help them orrange the following nonmetals in order of decreasing activity: 1.F.Cl,Br. Br, I,CI F I,Br,Cl,F F,Cl,Br,I Cl,F,I,Br

The correct answer is: $F,Cl,Br,I$<br /><br />Explanation: The reactivity of nonmetals is determined by their ability to gain electrons. The easier it is for an atom to gain electrons, the more reactive it is. In the given options, the nonmetals are arranged in order of decreasing reactivity as follows:<br /><br />1. Fluorine (F) is the most reactive nonmetal among the given options. It has the highest electronegativity and can easily gain electrons.<br />2. Chlorine (Cl) is less reactive than fluorine but more reactive than bromine and iodine.<br />3. Bromine (Br) is less reactive than chlorine but more reactive than iodine.<br />4. Iodine (I) is the least reactive nonmetal among the given options.<br /><br />Therefore, the correct order of decreasing reactivity is $F,Cl,Br,I$.