Question

1. which of the following lists shows the elemental symbols ranked in the order of increasing first ionization energy? clear all i,f,cl,br f,cl,i,br i,br,cl,f br,i,cl,f

Explanation:

The first - ionization energy generally increases across a period and decreases down a group in the periodic table. Fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) are in the same group (Group 17 - halogens). As we go down the group, the atomic radius increases, and the out - most electrons are farther from the nucleus, making them easier to remove. So, the first - ionization energy decreases in the order F > Cl > Br > I.

Answer:

D. Br, I, Cl, F