Question

re - order each list of elements in the table below, if necessary, so that the elements are listed in order of decreasing electronegativity.

elements	elements in order of decreasing electronegativity
i, cl, f

Explanation:

Step1: Recall electronegativity trends

Electronegativity increases across a period and decreases down a group in the periodic table.

Step2: Analyze Se, As, O

O is in period 2, Se and As are in period 4. O is more electronegative. Among Se and As, Se is more electronegative as it is to the right of As in the same period. So the order is O > Se > As.

Step3: Analyze I, Cl, F

F is in period 2, Cl in period 3 and I in period 5. The order of electronegativity is F > Cl > I as electronegativity decreases down a group.

Answer:

O, Se, As; F, Cl, I