Question

analyze the periodic table.
periodic table of the elements
arrange the elements in order of increasing chemical reactivity.
move the answer choices to the correct boxes.
fr na rb

Explanation:

Step1: Recall Reactivity Trend

In group 1 (alkali metals), reactivity increases down the group. Fr (Francium), Na (Sodium), Rb (Rubidium) are group 1 elements. Their positions down the group: Na is top, Rb is middle, Fr is bottom.

Step2: Arrange by Reactivity

Increasing reactivity means from least reactive to most reactive. So order is Na (least), then Rb, then Fr (most).

Answer:

First box (least reactive): Na
Middle box: Rb
Last box (most reactive): Fr

(Arrangement: Na < Rb < Fr)